The sky is dark at night:
A) because the stars in the Milky Way are far away.
B) because the Sun is on the other side of Earth.
C) because there are far fewer stars on the night side of Earth.
D) because all the light from all the objects in the universe hasn't arrived here yet.
E) because the quasars are too far away from Earth for their light to have arrived here.
Question 2
The Moon's Orientale and Mercury's ________ Basin are both huge, multiringed impact scars.
Fill in the blank(s) with correct word
The two bright stars are (left) Alpha Centauri and (right) Beta Centauri.
Internal structures of main sequence stars, convection zones with arrowed cycles and radiative zones
Illustration of the Milky Way galaxy, showing the location of the Sun
Binary Stars
A Subject Prepared for a Night’s Sleep in a Sleep Laboratory
Earth emits radiation back out to space from all surfaces, both day and night