Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download The Solar System
Document related concepts
International Ultraviolet Explorer wikipedia , lookup
Circumstellar habitable zone wikipedia , lookup
Observational astronomy wikipedia , lookup
Nebular hypothesis wikipedia , lookup
Planets beyond Neptune wikipedia , lookup
Aquarius (constellation) wikipedia , lookup
Copernican heliocentrism wikipedia , lookup
Dialogue Concerning the Two Chief World Systems wikipedia , lookup
Astronomical naming conventions wikipedia , lookup
Astronomical spectroscopy wikipedia , lookup
Rare Earth hypothesis wikipedia , lookup
History of astronomy wikipedia , lookup
Astrobiology wikipedia , lookup
Tropical year wikipedia , lookup
Astronomical unit wikipedia , lookup
Dwarf planet wikipedia , lookup
Satellite system (astronomy) wikipedia , lookup
Geocentric model wikipedia , lookup
Comparative planetary science wikipedia , lookup
Definition of planet wikipedia , lookup
Planetary system wikipedia , lookup
IAU definition of planet wikipedia , lookup
Late Heavy Bombardment wikipedia , lookup
Planetary habitability wikipedia , lookup
Planets in astrology wikipedia , lookup
Extraterrestrial life wikipedia , lookup
Hebrew astronomy wikipedia , lookup
Ancient Greek astronomy wikipedia , lookup
History of Solar System formation and evolution hypotheses wikipedia , lookup
Solar System wikipedia , lookup
Formation and evolution of the Solar System wikipedia , lookup
Transcript
The Solar System The universe contains over 100 billion galaxies. A galaxy is a group of billions of stars. Our own galaxy is called the Milky Way, and it contains about 100 billion stars, including our Sun. The Sun is at the centre of the solar system. The solar system contains different types of objects including: a star - the Sun planets, which go around the Sun satellites, which go around planets smaller objects such as asteroids and comets Heliocentric model People used to think that the Earth was at the centre of the universe, with everything going around it. We now know that this is not correct. The idea that fits scientific observations and allows us to predict the movement of the planets is called the heliocentric model. This just means that the Sun is at the centre of the solar system, and the Earth and other planets go around it. We say that the planets are in orbit around the Sun. The planets in order from the Sun Mercury to Pluto Although scientists have discovered some extra objects orbiting the Sun that may be planets, normally we assume that there are eight planets in the solar system. In order, working away from the Sun, these are: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune. If you can't remember the correct order, try this sentence, or make one up of your own: My Very Easy Method Just Speeds Up Naming
