use articles
What are five uses of a telescope?
What is the device used to read stars?
What instrument is used to study stars?
Which instrument is used to observe the sky?
What unit do we use to measure stars?
How to use the H-R diagram?
What characteristics of stars do we use to classify them?
How many planets have been discovered using astrometry?
What does a telescope use?
What did Milky Way used to be called?
What measurement do astronomers use?
Why do astronomers use astronomical units AU instead of kilometers/km?
What could Mars be used for?
Why don't we use kilometers in space?
What technology is used to study planets?
What devices are used to explore planets?
What type of rocket does NASA use?
When was nuclear power first used in space?
What major discoveries happened using the Hubble Space Telescope?
What was the first satellite to use nuclear power?
Do satellites use nuclear power?
Do the Russians still use Soyuz?
What type of fuel is used in rockets?
What equipment do scientists use to study galaxies?
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