Light-years and the Milky Way Galaxy
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Science
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8th Grade
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Carol Lee
Used 4K+ times
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13 Slides • 7 Questions
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Light-years and the Milky Way
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Multiple Choice
What spiral galaxy do we live in?
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Multiple Choice
What force keeps the arms of the Milky Way spinning around its center?
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Multiple Choice
Is the Milky Way the only galaxy in the universe?
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What is a Light-Year?
For most space objects, we use light-years to describe their DISTANCE. A light-year is the distance light travels in one Earth year. One light-year is about 6 trillion miles (9 trillion km).
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Looking Back in Time
When we use powerful telescopes to look at distant objects in space, we are actually looking back in time!
Light travels at a speed of 186,000 miles (or 300,000 km) per second. This seems really fast, but objects in space are so far away that it takes a lot of time for their light to reach us. The farther an object is, the farther in the past we see it
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The Andromeda Galaxy
The nearest large galaxy to us, Andromeda, is 2.5 million light-years away. So, we see Andromeda as it was 2.5 million years in the past. The universe is filled with billions of galaxies, all farther away than this. Some of these galaxies are much farther away.
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Multiple Choice
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Light-years and the Milky Way
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