7 ms·
>500 million light years away How are they able to know how far it's coming from?
by masked_titan 6y ago
>500 million light years away
How are they able to know how far it's coming from?
- unnouinceput 6y agohttps://sciencing.com/calculate-distance-light-5974042.html https://sciencing.com/calculate-distance-light-5974042.html