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The Milky Way and Galaxies
Question | Answer |
---|---|
Democritus | Greek philosopher who first claimed the Milky Way was a lot of distant stars. |
William Herschel | Made the first map of the Milky Way in 1785 |
How old is the Milky Way believed to be? | 13 billion years old |
Approximately how many stars does it contain? | 200-400 |
Appearance of the Milky Way | Big black hole in the centre surrounded by a bulge. Bulge is surrounded by a halo which is surround by spiral arms made of stars, gas and dust. |
How much of the Milky Way is invisible? | 90% of the Milky Way's matter is invisible and and still a mystery |
Why is the Milky Way brighter on the outside than the inside? | Younger, brighter stars are on the outside, and older, dimmer stars are in the inside. |
Where is the Milky Way best seen, and why? | Best seen in rural areas because there are not as many bright lights that block the light of the Milky Way and not as much foggy pollution |
Why can we only see parts of the Milky Way and not the whole thing? | Our Solar System is located in one of the Milky Way's spiral arms so we can only see the parts surrounding us. |
Dark Matter | Disguises light |
Black Hole | Hole of dark matter that sucks in everything including time and light |
Spiral and Barred Spiral Galaxies | Thin disk shaped galaxy with gas and dust-formed arms |
Elliptical Galaxies | Largest galaxy that is football-shaped |
Irregular Galaxies | misshaped galaxy because of interaction with other galaxies |