Timeline for How do we have photos of galaxies so far away?
Current License: CC BY-SA 3.0
3 events
| when toggle format | what | by | license | comment | |
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| Sep 11, 2017 at 12:57 | comment | added | zephyr | This is a useful point to make. If you spend the effort to calculate the total number of photons Andromeda emits per second, you'll find an astronomically high number (think $10^{60}\:\mathrm{photons/s}$ at a minimum). So its no wonder we can collect $\sim 10^3\:\mathrm{photons/pixel}$ in a single, longer-than-a-second observation with a telescope. | |
| Sep 11, 2017 at 3:10 | review | First posts | |||
| Sep 11, 2017 at 6:00 | |||||
| Sep 11, 2017 at 3:02 | history | answered | Rupert Morrish | CC BY-SA 3.0 |