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If there is no dark matter in the Milky Way Galaxy, what is the best alternative explanation for the observations?

Most astronomers now agree that dark matter probably does not really exist, and rather indicates a fundamental problem in our understanding of gravity.

Suppose a planet is discovered orbiting a star in a highly elliptical orbit. While the planet is close to the star it moves , but while it is far away it moves .

All of the following are burn resuscitation measures except:

Earth’s rotation defines a , the cycle of the Moon’s phases takes about a , and Earth’s orbit defines a .

Edwin Hubble discovered Hubble’s Law when he plotted the          of galaxies.

Which of the following is the most accurate description of the formation of the Solar System?

Edwin Hubble observed that most galaxies exhibit a redshift. We now call this the “cosmological redshift.” What is the cause of this redshift?

A geologically dead moon would show

The life stages of a low-mass star, starting with its birth and ending at its death are , , , , and . (Note that not all stages of life are given: just put the ones given in the proper order.)