1. There are millions of stars in our galaxy, the Milky Way
Stars and Planets
There are millions of stars in our galaxy, the Milky Way
Stars in the night sky are in fixed patterns called constellations
Planets move slowly across the constellations; their position depends on where they, and the Earth, are in orbits round the Sun.
Stars and Planets

2. Constellations
Constellations

3. Constellations
Constellations

4. Star birth
Stars form when dust and gas from space are pulled together by gravitational attraction. Planets are formed from any remaining dust and gas.
During the main sequence of a star the force of gravity pulling matter together is balanced by expansion forces caused by the high temperatures.
Star birth

5. Star birth
Star birth

6. Nuclear Fusion
Inside a star, the nuclei of lighter elements are fused together to produce nuclei of heavier elements (e.g. hydrogen nuclei fuse to become helium nuclei).
This is called nuclear fusion and it produces a large amount of energy which is radiated out into space
Nuclear fusion

7. Nuclear fusion
Nuclear fusion

8. Star death
After all the hydrogen has been converted to helium, the star expands to become a red giant.
If the red giant is ‘small’, the star contracts to become a white dwarf
If the red giant is ‘large’ the star contracts and then explodes (a supernova) throwing dust and gas into space. The matter left over can form a dense neutron star or a black hole
Star death

9. Death of a small star
Death of a small star

10. Death of a large star
Death of a large star

11. Star death
Star death

12. Star birth, life and death

13. Universe theories
The Big Bang theory suggests that the Universe may have started billions of years ago from a single concentrated point of matter which then exploded.
The Steady State theory states that the universe has always existed and always will.
Universe theories

14. Big Bang theory
Big bang theory

15. Evidence for the Big Bang includes;
Red Shift
Evidence for the Big Bang includes;
Light from other galaxies is shifted towards the red end of the spectrum. Other galaxies are moving away from us very quickly
The further away the galaxies, the bigger the ‘red-shift’. The further away the galaxy, the faster it is moving away from us.
This evidence suggests that the Universe
is expanding
Red shift

16. Light spectra
Light spectra

17. Red shift
Red shift

18. Red shift
Red shift

19. Extra-terrestrial lifeET

20. Quiz
Quiz

21. Wordsearch
Wordsearch