1. The empty spaces in the universe are immeasurable.
2. The distance from our sun to the nearest star is 4.2 light years.
3. A light year is a unit of distance that measures how far light travels in one year.
4. About thirty million similar collections (galaxies) are known to exist in the universe.
5. The noun forms are 'existence' and 'measurement'.
6. The Milky Way is a collection of about 300,000 million stars and is the crowded part of the universe where we live.
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