Timeline for Radiation from farther galaxies
Current License: CC BY-SA 3.0
5 events
| when toggle format | what | by | license | comment | |
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| Aug 6, 2012 at 15:48 | vote | accept | Waffle's Crazy Peanut | ||
| Aug 4, 2012 at 14:44 | history | edited | Martin Beckett | CC BY-SA 3.0 |
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| Aug 4, 2012 at 14:41 | comment | added | Martin Beckett | If you want to detect the photons coming toward you, you need to reflect them into your detector. Optical telescope mirrors are the size of a house while x-ray telescopes are the size of a garbage can, and only about 10% of their area is usable, - so the chances of a passing photon being reflected into the detector is smaller. So we see less x-ray photons and so need a much brighter or nearer source to detect it | |
| Aug 4, 2012 at 14:37 | history | edited | Martin Beckett | CC BY-SA 3.0 |
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| Aug 4, 2012 at 14:29 | history | answered | Martin Beckett | CC BY-SA 3.0 |