Answer:
The answer is A different types exist
Explanation:
Answer:
absolute brightness
Explanation:
The observational fact about a cepheid variable star that leads to a measurement of its distance from earth is that its period of variation is directly related to its absolute brightness
The Red Square is a Square in Russia, in Moscow, the capital of Russia.
It is famous for being next to the Kremlin, where the President of Russia resides, which is sometimes the name used for the Russian government and Russia generally.
Many military parades take place on this Square, so it is often seen on the television.
