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Nov 17 |
awarded | Yearling |
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Nov 10 |
awarded | Notable Question |
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Sep 21 |
awarded | Good Question |
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Jun 27 |
answered | Radiative transfer equation solution |
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May 4 |
awarded | Enlightened |
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May 4 |
awarded | Nice Answer |
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Apr 8 |
answered | Smithsonian Astrophysical Observatory (SAO) star catalog |
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Nov 17 |
awarded | Yearling |
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Oct 7 |
awarded | Popular Question |
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Aug 6 |
revised |
How can a laser pointer have range of several kilometers in atmosphere? typeos |
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Aug 6 |
comment |
How can a laser pointer have range of several kilometers in atmosphere? Those laser pointers (there are 5 actually) are used to play as artificial stars. They are more powerful (5W each) than handheld device, but ARE still pointers and have a range of several kilometers. Why do you think they are different ? |
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Aug 6 |
revised |
How can a laser pointer have range of several kilometers in atmosphere? added 105 characters in body |
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Aug 6 |
revised |
How can a laser pointer have range of several kilometers in atmosphere? added 156 characters in body |
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Aug 6 |
awarded | Critic |
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Aug 6 |
comment |
How can a laser pointer have range of several kilometers in atmosphere? Yep, I made a mistake here. The labled power on laser pointers is output power. The deviation between input power and output value is conversion efficiency. The typical input power of a 50mW pointer is about 0.5 W. But This is not the point. |
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Aug 6 |
revised |
How can a laser pointer have range of several kilometers in atmosphere? deleted 228 characters in body |
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Aug 6 |
answered | How can a laser pointer have range of several kilometers in atmosphere? |
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Jun 2 |
answered | Does Earth have a code name? |
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Feb 14 |
comment |
Why CAN we see the new moon at night? It is just a simplyfied 2D geometrical approximation. |
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Jan 31 |
comment |
Given temperature, composition, column density, and radial velocity, can I find the bulk flow of a gas cloud? The velocity example is only to get a feeling of possible scale. Don't take it seriously. As for the distribution of comparative transverse velocity, of course we can estimate the possibility of the velocity less than certain value for two independent objects. But this case may be simplified by their position, take a typical value of nearby object maybe a good approximation. |
