1
Group of planets that go around a star.
2
A group of galaxies.
3
The four planets nearest to the Sun: Mercury, Venus, the Earth and Mars.
4
The scientist who posed the Heliocentric theory.
5
Measure unit of the universe. The distance that light travels in a year. 9.4 × 1012 kilometers.
6
Celestial rocky body that goes around a planet.
7
The galaxy where we live.
8
It consists of a large numbers of galaxies joined in galaxy clusters.
9
The theory that explains the origin of the universe.
10
A group of stars, gases and dust.
11
The path travelled by an object moving around another one much bigger.
12
Measure unit of the universe. The distance between the sun and the Earth. 150.000.000 km.
