1. What is the basic difference between comets and asteroids?
a. Comets always emit their own light, while asteroids only reflect sunlight
b. Comets always move in open orbits around the Sun, visiting the Sun only once in their lifetime, while asteroids move in closed orbits
c. Comets are mostly composed of ices, while asteroids are mainly composed of rocks.
d. Comets are spherical, while asteroids are mostly irregular in shape.
2. More than any other, which physical parameter in the young solar system determined whether a planet became a terrestrial or jovial?
a. Mix of chemical constituents
b. Density of hydrogen gas in the nebula
c. Temperature distribution within the nebula
d. Overall rotation of the nebula
a. Comets always emit their own light, while asteroids only reflect sunlight
b. Comets always move in open orbits around the Sun, visiting the Sun only once in their lifetime, while asteroids move in closed orbits
c. Comets are mostly composed of ices, while asteroids are mainly composed of rocks.
d. Comets are spherical, while asteroids are mostly irregular in shape.
2. More than any other, which physical parameter in the young solar system determined whether a planet became a terrestrial or jovial?
a. Mix of chemical constituents
b. Density of hydrogen gas in the nebula
c. Temperature distribution within the nebula
d. Overall rotation of the nebula