The light-year is defined to be the a. time it takes light to travel from the Su
ID: 152701 • Letter: T
Question
The light-year is defined to be the
a. time it takes light to travel from the Sun to the Earth
b. time it takes for light to travel from the nearest star to the Earth
c. distance light travels in one year in space
d. average distance between the Earth and the nearest star
QUESTION 2 In the process of nuclear fusion,
a. two or more nuclei fuse or stick together to form a heavier nucleus whose combined mass is slightly greater than the original nucleus
b. two or more nuclei fuse or stick together to form a heavier nucleus whose combined mass is slightly less than the original nucleus
c. a heavy nucleus breaks apart into a number of smaller nuclei whose combined mass is less than the original nucleus
d. two or more nuclei fuse or stick together to form a heavier nucleus that has exactly the same mass as the original nucleus
QUESTION 3 In our solar system, terrestrial planets are
a. large, made of pure gases with low densities, and found far from the Sun
b. small, made mostly of rock and iron with high densities, and found close to the Sun
c. small, made of pure rock with high densities, and found close to the Sun
d. large, made mostly of gases and liquids with low densities, and found far from the Sun
QUESTION 4 In our solar system, Jovian planets are
a. large, made mostly of gases and liquids with low densities, and found far from the Sun
b. large, made of pure gases with low densities, and found far from the Sun
c. small, made of pure rock with high densities, and found close to the Sun
d. small, made mostly of rock and iron with high densities, and found close to the Sun
QUESTION 5 Between the orbits of the planets Mars and Jupiter we find
a. the asteroid belt
b. the Kuiper belt
c. the Oort cloud
d. Orion's belt
Explanation / Answer
Answer 1: c) distance light travels in one year in space.
Explanation : Light year is an astronomical unit of distance and it is defined as the distance that light can travel in one year.
Answer 2: a) two or more nuclei fuse or stick together to form a heavier nucleus whose combined mass is slightly greater than the original nucleus.
Explanation : Nuclear fusion is the process by which two or more atomic nuclei join or fuse together to form a single, heavier nucleus.
Answer 3: b) small, made mostly of rock and iron with high densities and found close to the Sun.
Explanation : Terrestrial planets are made up of rocks or metals with a hard solid suface and a molten heavy metal core. The first four planets in our solar system that are closest to the Sun are the terrestrial planets.
Answer 4: b) large, made of pure gases with low densities and found far from the Sun.
Explanation : The Jovian planets are also known as gas giants and they are composed primarily of helium and hydrogen with varying amounts of other gases.
Answer 5: a) The Asteroid belt.
Explanation : The Asteroid belt is a circumstellar disc that lies roughly between the orbits of the planets Mars and Jupiter.
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