- Created by: Sanya1014
- Created on: 09-03-19 14:14
What does the soalr system contain?
In our solar system there is one star, the sun, plus the eight planets and the dwarf planets that orbit around the sun.
What is the solar system a part of?
The solar system is part of the Milky Way galaxy
What is the Milky Way galaxy?
The Milky Way galaxy is a massive collection of billions of stars that are held together by gravity.
How was the solar system formed?
The solar system was formed from a h6ge cloud of dust and gas called a nebula.
How did the Sun form in the centre of the solar sy
The sun was formed in the centre by gravity pulling the cloud of dust and gas together.
What happened when the sun started shining?
When the Sun statred shining, the energy pushed most of the light gases to the edge of the solar system.
What are stars made from?
Stars are made from dust and gas in space. The gravitational attraction between the particles pulls them together. This holds the star together very tightly.
What is the universe made up of?
The universe is made up of dust and gas.
What is a galaxy?
A galaxy is a group of stars.
What force pulls the gas particles in a star toget
The gas particles in a star are pulled together by gravitational attraction between particles.
Why do stars try to expand?
Stars try to expand because the the high temperature and pressure in the star pushes it outwards, forcing it to expand.
What can you say about the forces in a star if the
If the forces in a star are stable, it means that they are balanced.
Describe nuclear fusion
Nuclear fusion happens when two small nuclei collide and fuse together to form a large nuclei.
When nuclear fusion occurs, energy is released in the process.
The colliding nuclei need to have enough kinetic energy to fuse, otherwise they will repel each other and will not fuse.
What happens when heat energy is released by nucle
The heat energy released by nuclear fusion in the star pushes outwards and counteracts gravity to make the star stable.
What happens when the star becomes stable?
When the star becomes stable, it eners the main sequence stage.
What is the flow diagram for stars?
What happens to stars smaller than the Sun?
Stars smaller than the sun:
- Expand and cool to turn into a Red Giant
- Contract and heat up to form a white dwarf
-Cool and fade into a black dwarf
What happens to stars bigger than the sun?
Stars bigger than the sun:
-Expand and cool to turn into a Red Suoer Giant
-Explode to form a Supernova
-Suoernova produces either a neutron star or a black hole
What happens to elements heavier than iron?
They can be formed in a Supernova.
What happens to elements lighter than iron?
Elements lighter than iron are made by fusion in stars.
Why is the rate of fusion faster in a large star?
The rate of fusion is faster in a large star because tge rate of fusion is dependent on the temperature. As bigger stars have a higher mass, it means they have a hotter core to let fusion occur quicker.
What does gravity provide the force to allow?
Gravity provides the force to allow planets and both artificial and natural satellites to maintain their circular orbits.
What is velocity?
Velocity is speed with a direction.
What happens to a moving object in a circle?
A moving object in a circle changes direction all the time. It accelerates (changes its velocity) towards the centre of the circle. The object changes in direction, not speed, so the speed stays constant.
What must happen for an object to remain in a stea
For an object to remain in a steady, circular orbit, it must be travelling at the right speed.
What happens the closer you get to a star or a pla
The closer you get to a star or a planet, the stronger the gravitational force is.
What happens with the stronger the force?
The stronger the force, the faster the orbiting object needs to travel to remain in orbit.