Which of the following can be used as standard candles for determining distance?

During star formation, the dense parts of the molecular cloud that collect material while contracting and heating up are known as

Stars spend 90% of their lifetime

List the Spectral types in order of temperature from Hottest to Coolest.

Match the number with the correct name for that part of the galaxy.

What was the age of the universe when it became transparent and photons could travel without running into anything?

What percentage of visible matter is made of Hydrogen?

What percentage of all the matter and radiation density is made of Dark Energy?

What percentage of the overall density of the universe is made up of dark matter combined with regular matter and energy?

Use the following table to answer the question. Star Apparent Magnitude (m) Absolute Magnitude (M) m-M Spectral Type 1 -1.46 1.46 0 F0 2 -0.72 -2.5 1.78 A1 3 0.12 -8.1 8.22 B8 4 0.41 -7.2 7.61 M2 5 -0.27 4.4 -4.67 G2     In which star’s spectrum are the hydrogen lines the strongest?