1. 1. The Milky Way Galaxy is a type of ________
A. Spiral galaxy
B. Cloud galaxy
C. Elliptical galaxy
D. Irregular galaxy

2. 2. A light year is 365 days the distance light travels in a year
the distance from Earth to Proximal
the amount of the light the sun produces in a year

3. 3. Astronomers have done chemical analysis of the atmosphere surrounding the planet of Jupiter. They found that it is about 92% hydrogen, 7% helium, 0.5% methane, and 0.5% ammonia. Which area of the graph represents helium?
A. Q
B. R
C. S
D. T

4. 4. The two factors that combine to keep the planets in orbit are
Gravity and orbital speed
Orbital speed and mass
Mass and inertia
Gravity and inertia

5. 5. Describe the similarities and differences between the inner and outer planets.