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13 Cards in this Set
- Front
- Back
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Rank Earth > Universe in order of size |
1. Earth 2. Sun 3. Solar System 4. Milky Way 5. Virgo Supercluster 6. Universe |
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If we compare our place in the universe with a very distant place, we can say that... |
All of the laws of physics are the same in each place. |
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Rank (Earth's radius > A light yr.) in order of size |
1. Radius of Earth 2. A light minute 3. Distance from Earth to the Sun 4. A light hour 5. Radius of the Solar System 6. A light year 7. 1000 light years 8. Milky Way Galaxy |
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What is our cosmic address? |
Earth Solar System Milky Way Galaxy Local Group Supercluster Universe |
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If the sun should suddenly explode, how soon would we know about it? |
We would know in about 8 minutes, which is the time it would take for the light of the explosion to reach earth. |
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Nebula |
An interstellar cloud of gas and dust that forms from the explosion of a dying star, and later compacts to birth a new star. |
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Galaxy |
A great island of stars in space, all held together by gravity, orbiting a common center. |
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Local Group |
Multiple galaxies clustered together in a group |
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Local Supercluster |
Groups of galaxies clustered together |
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The Big Bang |
~13.8 bil yrs ago Produced all matter, starting with mostly hydrogen & helium, which diversified into other elements. |
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Light Year (the distance light travels in 1 year) |
* A measure of distance ( 1light yr = ~5.9 tril mi.) - The absolute speed limit of the universe (300,000 km/s) - We see things as they looked in the past because it takes time for light in space to reach Earth. |
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Light Year Distances (how long does it take light from _____ to reach Earth?) |
Earth > Moon : 1.25 light seconds away Earth > Sun : 8.3 light minutes away Sun > Neptune : 8.3 light hours away |
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Why can't we see a galaxy 15 billion light yes away? |
Because looking that far away means looking to a time before the universe existed. |
