1 / 20

Year 7 Gravity and Space

Year 7 Gravity and Space. Sept 2011. Day and Night. Rotating Earth day & night – PlanetObserver You tube video. One day is one complete r otation of the earth a round its axis. A year. A year is one complete orbit of the Sun by the earth – 365 ¼ days

steffi
Download Presentation

Year 7 Gravity and Space

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Year 7 Gravity and Space Sept 2011

  2. Day and Night Rotating Earth day & night – PlanetObserver You tube video One day is one complete rotation of the earth around its axis

  3. A year A year is one complete orbit of the Sun by the earth – 365 ¼ days The sun is not drawn to scale here – it is much, much bigger than the earth

  4. The seasons The Earth is tipped over on its axis This means that when the northern Hemisphere is tipped towards the Sun – it is our summer, and when tipped away from the sun it is our winter (and summer in the Southern Hemisphere)

  5. The moon • We see the • Moon by • reflected • light from • the sun • So • We cannot • see the part • that is in • shadow. • This gives • us the • phases of • the moon • The moon • takes • approximately • 28 days to • go round the • Earth once

  6. The solar system My Mercury Very Venus Easy Earth Method Mars Just Jupiter Speeds Saturn Up Uranus Naming Neptune (Planets Pluto) Comets Asteroids Meteors Meteorites Asteroid belt Kuiper belt Moons Rings This is not to scale

  7. The planets Students do not have to remember planetary information. They need to remember the order of the planets and they need to know how to use data to find patterns and trends

  8. Past ideas about the universe

  9. Aristotle – everything went round the Earth

  10. Ptolemy's  outstanding contribution was to develop a mathematical model of the Solar System which could be used to calculate planet positions. He put the Earth at the centre, but realized that the planets did not simply orbit the Earth

  11. Copernicus put the Sun at the centre, planets and stars orbit around

  12. Newton • Newton recognized that other planets had moons

  13. Current ideas about the universe We live on a small planet, orbiting a smallish star, towards the edge of a spiral galaxy of stars we call the Milky Way. There are billions of stars within the Milky way. There are billions and billions of galaxies, some bigger, some smaller than ours. This is a view of a tiny section of the sky showing hundreds of galaxies A spiral galaxy – like our own

  14. The expanding Universe The speed and direction of galaxies can be measured using light. It show that the Universe is expanding

  15. The Big Bang Theory If the universe is expanding now, it must have been smaller in the past So at the beginning it must have been very, very small and then expanded outwards very quickly – the big bang

  16. Aliens We have found planets orbiting other stars – they may have life on them, but that life will be adapted to the environment of that planet and may not be like us

  17. The pull of gravity

  18. Satellites To put a satellite into orbit Get it high above the atmosphere Give it forward thrust The satellite will get pulled down by gravity, but the Earth is round and curves away. The satellite will continue to fall towards the Earth, but never reach it. It will be in orbit.

  19. orbits

More Related