Astro111N_ch1
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| According to current scientific estimates, when did the Big Bang occur? | about 14 billion years ago
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| On the cosmic calendar, which compresses the history of the universe into a single year, about when did Earth form? | in early September
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| On the cosmic calendar, which compresses the history of the universe into a single year, about when did life arise on Earth? | in September
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| On the cosmic calendar, which compresses the history of the universe into a single year, about when did early humans first walk on Earth? | just a few hours before midnight on December 31
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| Which of the following correctly lists our "cosmic address" from small to large? | Earth, solar system, Milky Way Galaxy, Local Group, Local Supercluster, universe;
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| When we say the universe is expanding, we mean that: | The average distance between galaxies is growing with time.
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| If stars existed but galaxies did not: | We would not exist because we are made of material that required recycling in galaxies.
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| Could we see a galaxy that is 20 billion light-years away? | No, because it would be beyond the bounds of our observable universe.
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| The star Betelgeuse is about 425 light-years away. If it explodes tonight: | We won't know about it until 425 years from now.
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| If we represent the solar system on a scale that allows us to walk from the Sun to Pluto in a few minutes, then: | the planets would all be marble size or smaller and the nearest stars would be thousands of miles away.
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| The total number of stars in the observable universe is roughly equivalent to: | the number of grains of sand on all the beaches on Earth.
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| The age of our solar system is about: | one-third of the age of the universe.
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| An astronomical unit is | Earth's average distance from the Sun.
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| The fact that nearly all galaxies are moving away from us, with more distant ones moving faster, helped us to conclude that: | The universe is expanding.
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| A typical galaxy contains about 100 billion stars, and there are approximately 100 billion galaxies in the observable universe. About how many stars are in the observable universe? | 10 to 22nd power
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| How long does it take light to travel from the Moon to Earth? | 1.28 s
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| How long does it take light to travel from the Sun to Earth? | 499 s
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Created by:
zemca
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