Who was the first person to realize that the planets move in elliptical paths around the sun?
A) Kepler
B) Copernicus
C) Brahe
D) Einstein
E) Galileo
A
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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?
Select the characterisitics that apply to both Jovian and terrestrial planets.
Select all that apply.
- Are spherical
- Earth-like
- Gas giant
- Had/has a hot interior
- Has an atmosphere
- Large
- Many moons
- May have rings
- Orbits around sun
- Rocky surface
- Small
- Strong gravitational field
Sixty miles per hour is the same as
a) 129 ft/s b) 41 ft/s c) 21 ft/s d) 88 ft/s
the magnetic field in the primed frame.
A. A B. B C. C D. D E. Toward the viewer F. Away from the viewer T. There is no field of this type.