Light Travel Time: Because of the finite speed of light, we see more distant objects as they were in the past. For example, we see the star Alpha Centauri as it was 4.4 years ago, and the Andromeda Galaxy as it was 2.5 million years ago
Astronomers are often asked how we know that these objects still exist when we look at them in the night sky. How would you try to answer this question?
Will vary.
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Angular momentum is greater for a satellite when it is at the
A) apogee (farthest point). B) perigee (nearest point). C) same at apogee and perigee
Which characteristic of Venus is NOT due to the runaway greenhouse effect?
A. thick lava that creates pillow-shaped domes B. clouds that completely hide the surface C. a very slow rotation rate D. surface temperatures that are higher than Mercury's
Saturn has a surface magnetic field weaker than Earth's
Indicate whether the statement is true or false
Two identical tiny balls of highly compressed matter are 1.50 m apart. When released in an orbiting space station, they accelerate toward each other at 2.00 cm/s2. What is the mass of each of them? (G = 6.67 × 10-11 N ? m2/kg2 )
What will be an ideal response?