Term
|
Definition
| a measure of distance; 1 AU equals the average distance between the Earth and the Sun (about 150 million km) |
|
|
Term
|
Definition
| study of the Universe and the objects in it |
|
|
Term
|
Definition
| layer of gases that surrounds a planet |
|
|
Term
|
Definition
| display of coloured lights that can be seen in the night sky at the Earth's poles; happens due to solar wind |
|
|
Term
|
Definition
| theory that the Universe formed when a dense point suddenly and rapidly expanded about 14 billion years ago |
|
|
Term
|
Definition
| group of stars that, from Earth, looks like a shape that we can recognize |
|
|
Term
|
Definition
| The outside layer of the Sun |
|
|
Term
|
Definition
| day when the hours of daylight and the hours of night are the same length |
|
|
Term
|
Definition
| group of hundreds of billions of stars held together by gravity |
|
|
Term
|
Definition
| a measure of distance; 1 ly is equal to the distance a beam of light can travel in one year (about 9 000 billion km) |
|
|
Term
|
Definition
| object shaped like a ball that orbits around a star |
|
|
Term
|
Definition
|
|
Term
|
Definition
| massive explosion on the surface of the Sun |
|
|
Term
|
Definition
| the Sun and all of the planets and other objects that are held together by the Sun's gravity |
|
|
Term
|
Definition
| hot ball of gases that shines because of nuclear fusion happening in its core |
|
|
Term
|
Definition
| place on the Sun's surface that is cooler than the areas around it |
|
|
Term
|
Definition
|
|
Term
|
Definition
| everything that exists: all of space, time, all of the forms of matter, and energy |
|
|
