Why can neither Venus nor Mercury remain visible throughout the night as the full Moon does?
What will be an ideal response?
Venus and Mercury orbit the Sun closer than does the Earth, so they never appear very far from the Sun.
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The Tully-Fisher relation uses the ________ of the spiral to find its luminosity
Fill in the blank(s) with correct word
Two space stations are at rest relative to each other and are 6.0 × 107 m apart, as measured by observers on the stations
A spaceship traveling from one station to the other at 0.90c relative to the stations passes both of them, one after the other. As measured by an observer in the spaceship, how long does it take to travel from one station to the other? (c = 3.00 × 108 m/s) A) 97 ms B) 510 ms C) 39 ms D) 220 ms E) 58 ms
What are sources of light pollution and how do those affect astronomical observations?
What will be an ideal response?
When an electron is added to an atom, a(n) ______________ ion is formed
Fill in the blank(s) with correct word