- Created by: ErinSunderland16
- Created on: 21-02-19 11:23
The solar system:
Structure of the Solar System:
- The Sun is a star in a galaxy called the milky way.
- The Solar system consists of the sun, planets, dwarf planets, moons, asteroids and comets.
- Planets, dwarf planets, asteroids and comets orbit the Sun.
- A moon orbits a planet.
- The Sun formed from a cloud of dust and gas (a nebula) which was pulled together by gravity.
- As the nebula collapsed, it became sufficiently hot and dense for nuclear fusion reactions to start.
- In a stable star like the Sun, gravitational collapse is balanced by expansion due to fusion energy.
- A protostar is the early stage in the formation of a star, before nuclear fusion occurs.
- Nuclear fusion is the joining together of two smaller atomic nuclei to produce a larger nucleus. Radiation is released when this happens. Nuclear fusion happens in stars like our Sun, and in hydrogen bombs.
- Planets follow circular orbits around the Sun.
- Satellites follow circular orbits around their planets.
- Gravity provides the force that causes planets and satellites to orbit.
- A satellite moving too quickly will leave orbit and move into space. A satellite moving too slowly will leave orbit and fall towards Earth.
- An artifical satellite in polar orbit travels faster and with a smaller orbital radius than one in a geostationary orbit.
- An object in a circular orbit at a constant speed is accelerating because its direction is constantly changing.
- For an orbit to be stable, the radius of the orbit must change if the speed of the orbiting object changes.
- The closer two bodies…