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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.

Geography

Keywords

Milky Way, spiral galaxy, galaxy, spiral arm, halo, Solar System, Sun, black hole, Orion, light year, star, astronomy, astrophysics, geography, physics

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Kepler space telescope

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

Observatory

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Planets, sizes

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

Telescopes

This animation shows optical and radiotelescopes used in astronomical observation.

The development of celestial mechanics

This animation introduces the studies of astronomers and physicists whose works fundamentally changed our view of the universe.

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.

Gravitational waves (LIGO)

Massive accelerating or orbiting bodies cause ripples in spacetime. These are called gravitational waves.

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.

Neptune

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

Satellite types

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

Saturn

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

The Sun

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

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

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Lunar eclipses occur when the Moon passes through the shadow cone of Earth

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

Sputnik 1 (1957)

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