Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download The Earth
Document related concepts
Spitzer Space Telescope wikipedia , lookup
History of astronomy wikipedia , lookup
Outer space wikipedia , lookup
Tropical year wikipedia , lookup
Gamma-ray burst wikipedia , lookup
Fermi paradox wikipedia , lookup
Space Interferometry Mission wikipedia , lookup
Aquarius (constellation) wikipedia , lookup
International Ultraviolet Explorer wikipedia , lookup
Astrobiology wikipedia , lookup
Hubble Deep Field wikipedia , lookup
Geocentric model wikipedia , lookup
Perseus (constellation) wikipedia , lookup
Formation and evolution of the Solar System wikipedia , lookup
Star formation wikipedia , lookup
H II region wikipedia , lookup
Corvus (constellation) wikipedia , lookup
Cosmic distance ladder wikipedia , lookup
Rare Earth hypothesis wikipedia , lookup
Observational astronomy wikipedia , lookup
Chronology of the universe wikipedia , lookup
Comparative planetary science wikipedia , lookup
Extraterrestrial skies wikipedia , lookup
Astronomical unit wikipedia , lookup
Andromeda Galaxy wikipedia , lookup
Observable universe wikipedia , lookup
Dialogue Concerning the Two Chief World Systems wikipedia , lookup
Extraterrestrial life wikipedia , lookup
Transcript
A walk through the Universe Space is big. You just won’t believe how vastly, hugely, mind-bogglingly big it is. I mean, you may think it’s a long way down the road to the chemist’s, but that's just peanuts to space. Douglas Adams, The Hitchhiker's Guide to the Galaxy English humorist & science fiction novelist (1952 - 2001) 1 2 The Earth We are here 3 4 Venus Mercury Mars EARTH 5 6 Uranus Jupiter Neptune Earth Pluto (not a planet) and its moon Charon Saturn 7 The Sun is our nearest star 8 The Solar System 9 The Milky Way (Our Galaxy) A hundred, thousand, million stars! 10 the Milky Way as seen from the Enterprise Light would take 100 000 years to travel across the galaxy. A hundred thousand light years across 11 Distances It takes 8 minutes for light to reach us from the Sun. A light-year is the distance travelled by light in 1 year. The Sun is our nearest star. Our next nearest star, Alpha Centauri is 4 light years away. The Milky Way is 100 000 light years across. 12 The local group of galaxies Andromeda is the nearest big galaxy to the Milky Way Milky Way 13 Light from Andromeda takes 2 million years to reach us. Milky Way Andromeda 14 The Local Supercluster Here the local group has shrunk to the size of the Milky Way in the last slide. Local group 15 Light from Virgo has taken 65 million years to reach us. It left when the dinosaurs were on Earth. Virgo Cluster 16 The Universe is mind-bogglingly big! The Sun is about 150 000 000 km away from Earth Bright stars in the night sky are about 1000 000 (1 million) times as far away as the Sun. The near galaxies are about 100 000 times as far away as the bright stars. 15 000 000 000 000 000 000 km 17 NASA 18
