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Planets, sizes

The inner planets of the Solar System are terrestrial planets while the outer planets are gas giants.

Geography

Keywords

planets, Solar System, inner planets, outer planets, rocky planet, gas planet, Sun, Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, red supergiant, axis of rotation, astronomy, geography

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The life-cycle of the Solar System

The formation of the Sun and the planets started with the contraction of a dust cloud about 4.5 billion years ago.

Earth

The Earth is a rocky planet with a solid crust and oxygen in its atmosphere.

Jupiter

Jupiter is the largest planet of the Solar System, it has two and a half times the mass of all the other planets combined.

Mercury

Mercury is innermost and smallest planet of the Solar System.

Milky Way

The diameter of our galaxy is about 100,000 light years; it contains more than 100 billion stars, one of which is our Sun.

Saturn

Saturn is the second largest planet in the Solar System, easily recognisable by its rings.

The New Horizons mission

The New Horizons space probe was launched in 2006, with the objective to study Pluto and the Kuiper Belt.

The Sun

The diameter of the Sun is about 109 times that of the Earth. Most of its mass consists of hydrogen.

Venus

Venus is the 2nd planet from the Sun, the brightest object on the night sky (after the Moon).

Voyager space probes

The Voyager space probes were the first man-made objects to leave the Solar System. They gather data about outer space and carry information about humanity.

Hubble Space Telescope

The Hubble Space Telescope orbits outside the distorting influence of Earth´s atmosphere.

Neptune

Neptune is the outermost planet of the Solar System, the smallest of the giant planets

Solar eclipse

When the Sun, Earth, and the Moon are arranged in a straight line, the Moon can partially or completely obscure the Sun.

The Dawn mission

Studying Ceres and Vesta will help us learn more about the early history of the Solar System and how rocky planets are formed.

Kepler space telescope

The Kepler space telescope was launched by NASA to discover Earth-like planets orbiting other stars

Mars Exploration Program

Space probes and Mars rovers examine the structure of Mars and possible traces of life.

Space Shuttle

The Space Shuttle was a manned, reusable spacecraft operated by NASA.

Sputnik 1 (1957)

The Soviet-made satellite was the first spacecraft to be launched into outer space (in October 1957).

Types of stars

This animation demonstrates the process of star development for average and massive stars.

ISS

The International Space Station is a habitable satellite built with the cooperation of 16 countries.

Satellite types

Satellites orbiting the Earth can be used for civilian or military purposes.

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