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
Synaptic response of photoreceptors to dark and light.
All objects in the image are distant galaxies – not stars
A laser-guided observation of the Milky Way Galaxy at the Paranal Observatory in Chile in 2010.
Rising and Setting of Stars at the Equator
A Typical Pattern of Sleep Stages During a Single Night
Antigen (dark green and orange) and antibody (blue and green) binding forming a complex.