Term
| If circumference of the earth were increasing which city would be moving away from oxford? |
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Definition
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Term
| If circumference of the earth were increasing, which city would be moving away from paris france the most rapidly |
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Definition
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Term
| which of these particles was most common immediately after the big bang and on earth today? |
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Definition
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Term
| what happens when matter and anti-matter meet? |
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Definition
| e=mc2 They annihilate and releasing large quantity of energy |
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Term
| Are there equal amounts of matter and anti-matter on earth today? What fraction of the universe is helium? Hydrogen? |
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Definition
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Term
| What is the orgin of most helium found in our solar system today? |
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Definition
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Term
| Which of the following has spent the longest time traveling in space before reaching the earth today? |
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Definition
| radio signals from quasers |
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Term
| Did the big bang produce elements heavier than helium? |
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Definition
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Term
| which force prevents all the positively charged protons in an iron nucleus from tearing it apart |
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Definition
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Term
| Which force causes galaxies in the coma cluster to orbit? |
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Definition
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Term
| Which force causes an electron to orbit a proton? |
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Definition
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Term
| Which force is involved in the radioactive decay of a neutron? |
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Definition
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Term
| About 25% of the hydrogen produced in the big bang was turned into helium. why hasnt more of the hydrogen fused into helium? |
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Definition
| B/c it got paired with protons & neutrons and made deutrium |
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Term
| Which of these particles has the largest mass? |
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Definition
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Term
| What formed when the universe became transparent to light? |
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Definition
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Term
| Can 3K cosmic background radiation be observed to be coming from all directions? |
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Definition
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Term
| Which of the following has spent the longest time traveling in space before reaching the earth today? |
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Definition
| radio signals from quasars |
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Term
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Definition
| argument that darkness of the night sky conflicts with assumption of infinite and eternal static universe |
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Term
| What determines whether the universe is open or closed? |
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Definition
| negative curvature=open positive=closed |
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Term
| What is the critical density of matter needed to cause the universe to eventually collapse? |
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Definition
| 10^-29 grams per cubic centimeters |
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Term
| What fraction of the milky way galaxy is dark matter? |
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Definition
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