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  • Asteroid Impact in Nubian Desert Tracked | astrofoto.org
    s that it just so happened to be looking in the right direction part that bothers me Roland Roberts s blog Log in to post comments Printer friendly version PDF version Navigation Calendar Gallery Constellations Messier Objects M27 The Dumbell Nebula Resources Astronomy Books Buying A Star Buying A Telescope Clubs and Organizations General Interest Imaging and Astrophotography Magazines Mailing Lists and News Groups Science Toy Suppliers Software Weather Information Tips and Tricks Roland s Corner Recent content About Copyright Search form Search User login Username Password Request new password Science Daily Mercury Mercury gets a meteoroid shower from Comet Encke Mercury gets a meteoroid shower from Comet Encke More Science Daily Venus The aliens are silent because they re dead The aliens are silent because they re dead More Science Daily Mars Antarctic fungi survive Martian conditions on the International Space Station Antarctic fungi survive Martian conditions on the International Space Station Rotation speed may be bad news for Red Planet pioneers Rotation speed may be bad news for Red Planet pioneers The aliens are silent because they re dead More Science Daily Jupiter New study challenges Jupiter s role as planetary shield protecting Earth from comet impacts New study challenges Jupiter s role as planetary shield protecting Earth from comet impacts NASA telescopes detect Jupiter like storm on small star NASA telescopes detect Jupiter like storm on small star Simulating the jet streams and anticyclones of Jupiter and Saturn More Science Daily Saturn Cassini completes final close Enceladus flyby Cassini completes final close Enceladus flyby How water escapes from Saturn Magnetic reconnection How water escapes from Saturn Magnetic reconnection Explosive energy in Saturn s magnetic bubble More Science Daily Neptune Evidence of a real ninth planet discovered Evidence of a real ninth planet discovered Mars to lose its largest moon Phobos but gain a ring Mars to lose its largest moon Phobos but gain a ring Simulation of 3 D exotic clouds on an exoplanet More Science Daily Uranus Jupiter bumped giant planet from our solar system This solar system isn t big enough for the both of us Jupiter More Science Daily Pluto Earth like planets have Earth like interiors Earth like planets have Earth like interiors Evidence of a real ninth planet discovered Evidence of a real ninth planet discovered New Horizons returns first of the best images of Pluto More Science Daily Comets and Asteroids Earth like planets have Earth like interiors Earth like planets have Earth like interiors Artistic space odyssey to broadcast people s messages to the stars Artistic space odyssey to broadcast people s messages to the stars New study challenges Jupiter s role as planetary shield protecting Earth from comet impacts More Science Daily Kuiper Belt Earth like planets have Earth like interiors Earth like planets have Earth like interiors Evidence of a real ninth planet discovered Evidence of a real ninth planet discovered New Horizons returns first of the best images of Pluto More Astronomy News NASA s Great Observatories

    Original URL path: http://www.astrofoto.org/node/1186 (2016-02-13)
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  • Open Source Physics Educational Java Tools | astrofoto.org
    Physics3D Scroll down the page there to find the reference to 3D Multimedia Lab for Exploring Physics where the toys are located Or you can find Step in the KDE educational package although it is a little harder since you have to setup the experiment yourself Roland Roberts s blog Log in to post comments Printer friendly version PDF version Navigation Calendar Gallery Constellations Messier Objects M27 The Dumbell Nebula Resources Astronomy Books Buying A Star Buying A Telescope Clubs and Organizations General Interest Imaging and Astrophotography Magazines Mailing Lists and News Groups Science Toy Suppliers Software Weather Information Tips and Tricks Roland s Corner Recent content About Copyright Search form Search User login Username Password Request new password Science Daily Mercury Mercury gets a meteoroid shower from Comet Encke Mercury gets a meteoroid shower from Comet Encke More Science Daily Venus The aliens are silent because they re dead The aliens are silent because they re dead More Science Daily Mars Antarctic fungi survive Martian conditions on the International Space Station Antarctic fungi survive Martian conditions on the International Space Station Rotation speed may be bad news for Red Planet pioneers Rotation speed may be bad news for Red Planet pioneers The aliens are silent because they re dead More Science Daily Jupiter New study challenges Jupiter s role as planetary shield protecting Earth from comet impacts New study challenges Jupiter s role as planetary shield protecting Earth from comet impacts NASA telescopes detect Jupiter like storm on small star NASA telescopes detect Jupiter like storm on small star Simulating the jet streams and anticyclones of Jupiter and Saturn More Science Daily Saturn Cassini completes final close Enceladus flyby Cassini completes final close Enceladus flyby How water escapes from Saturn Magnetic reconnection How water escapes from Saturn Magnetic reconnection Explosive energy in Saturn s magnetic bubble More Science Daily Neptune Evidence of a real ninth planet discovered Evidence of a real ninth planet discovered Mars to lose its largest moon Phobos but gain a ring Mars to lose its largest moon Phobos but gain a ring Simulation of 3 D exotic clouds on an exoplanet More Science Daily Uranus Jupiter bumped giant planet from our solar system This solar system isn t big enough for the both of us Jupiter More Science Daily Pluto Earth like planets have Earth like interiors Earth like planets have Earth like interiors Evidence of a real ninth planet discovered Evidence of a real ninth planet discovered New Horizons returns first of the best images of Pluto More Science Daily Comets and Asteroids Earth like planets have Earth like interiors Earth like planets have Earth like interiors Artistic space odyssey to broadcast people s messages to the stars Artistic space odyssey to broadcast people s messages to the stars New study challenges Jupiter s role as planetary shield protecting Earth from comet impacts More Science Daily Kuiper Belt Earth like planets have Earth like interiors Earth like planets have Earth like interiors Evidence of

    Original URL path: http://www.astrofoto.org/node/1185 (2016-02-13)
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  • C/2007 N3 Lulin from Brooklyn | astrofoto.org
    because they re dead More Science Daily Mars Antarctic fungi survive Martian conditions on the International Space Station Antarctic fungi survive Martian conditions on the International Space Station Rotation speed may be bad news for Red Planet pioneers Rotation speed may be bad news for Red Planet pioneers The aliens are silent because they re dead More Science Daily Jupiter New study challenges Jupiter s role as planetary shield protecting Earth from comet impacts New study challenges Jupiter s role as planetary shield protecting Earth from comet impacts NASA telescopes detect Jupiter like storm on small star NASA telescopes detect Jupiter like storm on small star Simulating the jet streams and anticyclones of Jupiter and Saturn More Science Daily Saturn Cassini completes final close Enceladus flyby Cassini completes final close Enceladus flyby How water escapes from Saturn Magnetic reconnection How water escapes from Saturn Magnetic reconnection Explosive energy in Saturn s magnetic bubble More Science Daily Neptune Evidence of a real ninth planet discovered Evidence of a real ninth planet discovered Mars to lose its largest moon Phobos but gain a ring Mars to lose its largest moon Phobos but gain a ring Simulation of 3 D exotic clouds on an exoplanet More Science Daily Uranus Jupiter bumped giant planet from our solar system This solar system isn t big enough for the both of us Jupiter More Science Daily Pluto Earth like planets have Earth like interiors Earth like planets have Earth like interiors Evidence of a real ninth planet discovered Evidence of a real ninth planet discovered New Horizons returns first of the best images of Pluto More Science Daily Comets and Asteroids Earth like planets have Earth like interiors Earth like planets have Earth like interiors Artistic space odyssey to broadcast people s messages to the stars

    Original URL path: http://www.astrofoto.org/node/1184 (2016-02-13)
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  • Another Reason to Turn off the Lights | astrofoto.org
    fungi survive Martian conditions on the International Space Station Rotation speed may be bad news for Red Planet pioneers Rotation speed may be bad news for Red Planet pioneers The aliens are silent because they re dead More Science Daily Jupiter New study challenges Jupiter s role as planetary shield protecting Earth from comet impacts New study challenges Jupiter s role as planetary shield protecting Earth from comet impacts NASA telescopes detect Jupiter like storm on small star NASA telescopes detect Jupiter like storm on small star Simulating the jet streams and anticyclones of Jupiter and Saturn More Science Daily Saturn Cassini completes final close Enceladus flyby Cassini completes final close Enceladus flyby How water escapes from Saturn Magnetic reconnection How water escapes from Saturn Magnetic reconnection Explosive energy in Saturn s magnetic bubble More Science Daily Neptune Evidence of a real ninth planet discovered Evidence of a real ninth planet discovered Mars to lose its largest moon Phobos but gain a ring Mars to lose its largest moon Phobos but gain a ring Simulation of 3 D exotic clouds on an exoplanet More Science Daily Uranus Jupiter bumped giant planet from our solar system This solar system isn t big enough for the both of us Jupiter More Science Daily Pluto Earth like planets have Earth like interiors Earth like planets have Earth like interiors Evidence of a real ninth planet discovered Evidence of a real ninth planet discovered New Horizons returns first of the best images of Pluto More Science Daily Comets and Asteroids Earth like planets have Earth like interiors Earth like planets have Earth like interiors Artistic space odyssey to broadcast people s messages to the stars Artistic space odyssey to broadcast people s messages to the stars New study challenges Jupiter s role as planetary

    Original URL path: http://www.astrofoto.org/node/1183 (2016-02-13)
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  • Pendulums | astrofoto.org
    inch Our measurements were the length of the string but the correct length for a pendulum is the from the beam to the center of mass which is effectively the center of the bob we used 10 pound nylon fishing line img assist nid 829 title Pendulum Period desc link node align undefined width 500 height 500 As you can see his measurements are quite good In fact what surprised me the most is how good and consistent his reaction times are I now wish we had pushed the length down another inch It would have been difficult but we might have made it and at that point the deviation from a straight line becomes even bigger We could have also tried going for longer lengths if we d been a little more creative The stand I was using didn t let us reach higher than final 24 inch measurment but we could have put the whole thing on the kitchen counter and got lengths up to nearly 60 inches The blue dotted straight line is there only to show that the data do not fall on a straight line It s not completely obvious that this is not true which is why extending the data to longer and shorter lengths would have been good Oh well It s still a good experiment and good work by Jonathan Roland Roberts s blog Log in to post comments Printer friendly version PDF version Navigation Calendar Gallery Constellations Messier Objects M27 The Dumbell Nebula Resources Astronomy Books Buying A Star Buying A Telescope Clubs and Organizations General Interest Imaging and Astrophotography Magazines Mailing Lists and News Groups Science Toy Suppliers Software Weather Information Tips and Tricks Roland s Corner Recent content About Copyright Search form Search User login Username Password Request new password Science Daily Mercury Mercury gets a meteoroid shower from Comet Encke Mercury gets a meteoroid shower from Comet Encke More Science Daily Venus The aliens are silent because they re dead The aliens are silent because they re dead More Science Daily Mars Antarctic fungi survive Martian conditions on the International Space Station Antarctic fungi survive Martian conditions on the International Space Station Rotation speed may be bad news for Red Planet pioneers Rotation speed may be bad news for Red Planet pioneers The aliens are silent because they re dead More Science Daily Jupiter New study challenges Jupiter s role as planetary shield protecting Earth from comet impacts New study challenges Jupiter s role as planetary shield protecting Earth from comet impacts NASA telescopes detect Jupiter like storm on small star NASA telescopes detect Jupiter like storm on small star Simulating the jet streams and anticyclones of Jupiter and Saturn More Science Daily Saturn Cassini completes final close Enceladus flyby Cassini completes final close Enceladus flyby How water escapes from Saturn Magnetic reconnection How water escapes from Saturn Magnetic reconnection Explosive energy in Saturn s magnetic bubble More Science Daily Neptune Evidence of a real ninth planet discovered

    Original URL path: http://www.astrofoto.org/node/1181 (2016-02-13)
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  • How Fast is Sound? | astrofoto.org
    no real math needed Once you have all of your speeds at various temperatures set up another page in the spreadsheet with the speed and temperature measurements and have the spreadsheet calculate the slope of that line Presto you ve got the amount the speed of sound changes with the temperature Here is a not quite typical view from Audacity which is what we used to acquire the data Audacity conveniently runs on both Mac and Linux and Windows too if you care which I don t Version 2 of Audacity does not read out time separations in milliseconds like version 1 does Instead you read out the separation in samples and convert 48 000 samples second for our setup This had the disadvantage of requiring that I spend a little more time explaining the idea to Matthew but he grasped the idea almost immediately Converting between units samples to seconds seconds to milliseconds whatever isn t quite second nature to him at this stage but he did quite well This particular measurement showed clipping the red parts where the sound went off scale due to the microphone gain being set too high In spite of that it was possible to get a good time measurement when zoomed in because there was no clipping in the first few oscillations img assist nid 836 title Typical Two Microphone Measurement with Significant Clipping desc link node align center width 500 height 307 Satisfyingly the measurement was very close to the accepted value of 0 6 m s ºC Actually it was surprisingly close but that is at least in part luck We made 5 measurements and all but one were done outdoors in the cold I ll show the plot below where you will see that our errors are largest for the outdoor measurements Surprise We got sloppy in the cold Something about freezing your hands trying to use the laptop touchpad makes your rush a little For the record the accepted value for the speed of sound in the temperature range 0 100ºC is v 331 m s 0 6 m s ºC Our measurement was v 332 m s 0 6 m s ºC The plot below shows the results along with the errors Matthew s analysis showed a slightly different result since it did not include an error analysis or a weighted fit The slope was indistinguishably different but the intercept speed a 0ºC came out at 333 m s You may already have everything you need to try this yourself img assist nid 827 title Speed of Sound Temperature Dependence desc link node align center width 500 height 500 Here is a schematic of the circuit for converting two el cheapo microphones to a powered line in for your computer I bought two lapel microphones for about 6 7 each The other parts were from Radio Shack Click through for a larger image and more details img assist nid 837 title Powered Microphone Schematic desc link node align

    Original URL path: http://www.astrofoto.org/node/1182 (2016-02-13)
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  • Ansel Adams Trivia | astrofoto.org
    fungi survive Martian conditions on the International Space Station Rotation speed may be bad news for Red Planet pioneers Rotation speed may be bad news for Red Planet pioneers The aliens are silent because they re dead More Science Daily Jupiter New study challenges Jupiter s role as planetary shield protecting Earth from comet impacts New study challenges Jupiter s role as planetary shield protecting Earth from comet impacts NASA telescopes detect Jupiter like storm on small star NASA telescopes detect Jupiter like storm on small star Simulating the jet streams and anticyclones of Jupiter and Saturn More Science Daily Saturn Cassini completes final close Enceladus flyby Cassini completes final close Enceladus flyby How water escapes from Saturn Magnetic reconnection How water escapes from Saturn Magnetic reconnection Explosive energy in Saturn s magnetic bubble More Science Daily Neptune Evidence of a real ninth planet discovered Evidence of a real ninth planet discovered Mars to lose its largest moon Phobos but gain a ring Mars to lose its largest moon Phobos but gain a ring Simulation of 3 D exotic clouds on an exoplanet More Science Daily Uranus Jupiter bumped giant planet from our solar system This solar system isn t big enough for the both of us Jupiter More Science Daily Pluto Earth like planets have Earth like interiors Earth like planets have Earth like interiors Evidence of a real ninth planet discovered Evidence of a real ninth planet discovered New Horizons returns first of the best images of Pluto More Science Daily Comets and Asteroids Earth like planets have Earth like interiors Earth like planets have Earth like interiors Artistic space odyssey to broadcast people s messages to the stars Artistic space odyssey to broadcast people s messages to the stars New study challenges Jupiter s role as planetary

    Original URL path: http://www.astrofoto.org/node/1180 (2016-02-13)
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  • astrofoto.org
    Wed 03 05 2008 16 51 I knew it existed and always thought it was a cool idea but today I got to use it For those of you who think I m talking about Peabody and Sherman Help me Mr Wizard no I m talking about the the Web Archive For those of you too young to have a clue about Peabody and Sherman click on through Read more about Wayback Machine is Way Cool Roland Roberts s blog Log in to post comments News feeds okay again Submitted by Roland Roberts on Thu 02 28 2008 21 10 The news feed problem is largely resolved Except for Pluto which isn t a planet anymore anyway right they were either fixed or the source or else were due to a configuration problem on my side Pluto has some problems and I ve forced in current feed information but the problem will have to get fixed on the source or it will go stale again Read more about News feeds okay again Roland Roberts s blog Log in to post comments Broken Incoming News Feeds Submitted by Roland Roberts on Thu 02 28 2008 13 26 Read more about Broken Incoming News Feeds Roland Roberts s blog Log in to post comments Lunar Eclipse Visible Submitted by Roland Roberts on Thu 02 21 2008 02 01 img assist nid 689 title 2008 02 20 Lunar Eclipse desc link node align undefined width 640 height 640 Starting around 2 pm EST the clouds rolled in and it didn t look good for viewing But around 8 30 pm the clouds thinned allowing a fuzzy moon to be visible through and between the clouds so we could see the eclipse begin By 10 pm the skies had completely cleared an we were able to view totality without any clouds now if we could just do it without that streetlight at the end of the block Read more about Lunar Eclipse Visible Roland Roberts s blog Log in to post comments Pages first previous 9 10 11 12 13 14 15 16 17 next last Navigation Calendar Gallery Constellations Messier Objects M27 The Dumbell Nebula Resources Astronomy Books Buying A Star Buying A Telescope Clubs and Organizations General Interest Imaging and Astrophotography Magazines Mailing Lists and News Groups Science Toy Suppliers Software Weather Information Tips and Tricks Roland s Corner Recent content About Copyright Search form Search User login Username Password Request new password Science Daily Mercury Mercury gets a meteoroid shower from Comet Encke Mercury gets a meteoroid shower from Comet Encke More Science Daily Venus The aliens are silent because they re dead The aliens are silent because they re dead More Science Daily Mars Antarctic fungi survive Martian conditions on the International Space Station Antarctic fungi survive Martian conditions on the International Space Station Rotation speed may be bad news for Red Planet pioneers Rotation speed may be bad news for Red Planet pioneers The aliens are silent because they

    Original URL path: http://www.astrofoto.org/node?page=12 (2016-02-13)
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