A unit of astronomical distance
equivalent to the distance that light
travels in one year, which is 9.4607
10 (12)km (nearly 6 trillion miles).
All existing matter and space
considered as a whole; the cosmos.
Earth to moon: 1.29 light seconds.
Earth to mars: 12.7 light minutes
Earth to Centauri Proxima (nearest star) 4.3
Earth to sun: 8 light minutes
Other Side of
Earth to other side of Mi
Research the age, origin and process of formation of the universe.
Doppler effect: increase (or decrease) in the frequency of sound, light,
or other waves as the source and observer move toward (or away
from) each other. The effect causes the s