Earth Science i really need help with

The apparent backward movement of a planet is called

Aheliocentric motion.
Bretrograde motion.
Ceccentricity.
DKepler's first law of motion.

Who first introduced the idea that the Sun is the center of the universe?

ANicolaus Copernicus
BJohannes Kepler
CAlbert Einstein
DEdwin Hubble

The four giant gas planets that are made primarily of lightweight elements are

AVenus, Saturn, Uranus, and Neptune.
BJupiter, Saturn, Uranus, and Neptune.
CEarth, Saturn, Neptune, and Venus.
DMercury, Venus, Earth, and Neptune.

Question

06-04-2015
Biology

Answered

Earth Science i really need help with

The apparent backward movement of a planet is called

Aheliocentric motion.
Bretrograde motion.
Ceccentricity.
DKepler's first law of motion.

Who first introduced the idea that the Sun is the center of the universe?

ANicolaus Copernicus
BJohannes Kepler
CAlbert Einstein
DEdwin Hubble

The four giant gas planets that are made primarily of lightweight elements are

AVenus, Saturn, Uranus, and Neptune.
BJupiter, Saturn, Uranus, and Neptune.
CEarth, Saturn, Neptune, and Venus.
DMercury, Venus, Earth, and Neptune.

Verified Answer :

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Greenleafable Greenleafable · Answer 1 · 2017-03-14T11:26:05-04:00

18.) Apparent retrograde motion is the apparent motion of a planet in a direction opposite to that of other bodies within its system, as observed from a particular vantage point. Thus option B is the correct answer. 19) Nicolas Copernicus developed the heliocentric model in the 16th century, which led to the believe that the sun is the center of the Universe, with the planets (including Earth) and stars orbiting it. 20.) A gas giant is a large planet composed mostly of gases, such as hydrogen and helium, with a relatively small rocky core. The gas giants of our solar system are Jupiter, Saturn, Uranus and Neptune.