Earth And Space Flashcards

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1
Q

Galaxies

A

a system of millions or billions of stars, together with gas and dust, held together by gravitational attraction

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2
Q

Solar system

A

the collection of eight planets and their moons in orbit round the sun, together with smaller bodies in the form of asteroids, meteoroids, and comets.

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3
Q

Astronomer

A

an expert in or student of astronomy.

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4
Q

Expanding

A

undergo a continuous change

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5
Q

Singularity

A

a point at which a function takes an infinite value, especially in space–time when matter is infinitely dense, such as at the centre of a black hole.

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6
Q

Cosmology

A

The study of the formation of the universe

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7
Q

Star

A

A celestial body that generates its own light and heat.

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8
Q

Celestial body

A

Any naturally made object outside the world’s atmosphere

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