Earth Sci Lesson 2

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問題一覧

To spin around a center

Rotate

An imaginary line that an object rotates around

Axis

To move around another object

Revolve

The path that an object takes as it goes around another object

Orbit

The four inner planets are:

Mercury, Venus, Earth, Mars

The four outer planets or giant planets are:

Jupiter, Saturn, Uranus, Neptune

It was suggested by the Russian astronomer Viktor Safronov.

Planetesimal Theory

According to a British Astronomer, Fred Hoyle that sun once had a companion star.

Companion Star Theory

According to this theory, the solar system started as a huge cloud of gas (nebula) which was mostly composed of hydrogen and helium gases.

Nebular Theory

According to this theory, the solar system started as a huge cloud of gas (nebula) which was mostly composed of _______ and _______ gases.

Hydrogen, Helium

The ___ is the star at the center of the Solar system which is composed mainly hydrogen and helium. It also contains oxygen, carbon, neon, and iron in small quantity.

Sun

Planetesimal theory was suggested by the Russian astronomer __________.

Viktor Safronov

According to a British Astronomer, ________ that sun once had a companion star.

Fred Hoyle

The nebular hypothesis is the most widely accepted model in the field of cosmogony to explain the formation and evolution of the Solar System. The theory was developed by ___________ and published in his Universal Natural History and Theory of the Heavens (1755) and then modified in 1796 by ____________.

Immanuel Kant, Pierre Laplace

_____ is the smallest planet in the solar system and it is closest to the Sun.

Mercury

It orbits around the Sun about 88 Earth days which is much faster than any other planet in the solar system. It has no natural satellites.

Mercury

______ is the second planet from the Sun and is Earth’s closest planetary neighbor. It is the hottest planet because of dense atmosphere.It’s one of the four inner, terrestrial (or rocky) planets, and it’s often called Earth’s twin because it’s similar in size and density.

Venus

________ is the third planet from the Sun, and the only place we know of so far that’s inhabited by living things.

Earth

It is the fourth planet from the Sun, next planet beyond Earth. It is the second smallest planet in the Solar system.

Mars

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60問 • 3年前

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65問 • 3年前

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