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Astro111N_ch1

QuestionAnswer
According to current scientific estimates, when did the Big Bang occur? about 14 billion years ago
On the cosmic calendar, which compresses the history of the universe into a single year, about when did Earth form? in early September
On the cosmic calendar, which compresses the history of the universe into a single year, about when did life arise on Earth? in September
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
Which of the following correctly lists our "cosmic address" from small to large? Earth, solar system, Milky Way Galaxy, Local Group, Local Supercluster, universe;
When we say the universe is expanding, we mean that: The average distance between galaxies is growing with time.
If stars existed but galaxies did not: We would not exist because we are made of material that required recycling in galaxies.
Could we see a galaxy that is 20 billion light-years away? No, because it would be beyond the bounds of our observable universe.
The star Betelgeuse is about 425 light-years away. If it explodes tonight: We won't know about it until 425 years from now.
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.
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.
The age of our solar system is about: one-third of the age of the universe.
An astronomical unit is Earth's average distance from the Sun.
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.
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
How long does it take light to travel from the Moon to Earth? 1.28 s
How long does it take light to travel from the Sun to Earth? 499 s
Created by: zemca
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