Which two properties did Hertzsprung and Russell use to classify stars?

Why are stars different colors?

What is the general relationship between the surface temperature and magnitude of a main sequence star?

Which of the following describes the characteristics of the Milky Way Galaxy?

Our Sun is one of many stars that has been classified as average. Its absolute magnitude and its temperature place it in the middle of what group on the Hertzsprung Russell diagram?

In between stars, great clouds of dust and gas are where stars are born. What is this collection of dust and gas called?

Where in the Milky Way Galaxy would our solar system be found?

The Sun appears larger than other stars because of its...

How do scientists use light years?

The planets revolve around our Sun which is the center of our solar system. What keeps our planets in orbit around the Sun?

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