The ___________ mass is a standard way to express mass in astronomy and is used to describe the masses of other stars and galaxies. :Solar. Solar mass is equal to the mass of the sun, about 332,950 times the mass of the Earth. The accepted symbol and value for solar mass is:A __________ ________ is the distance light travels in a vacuum in one year. :Light year (LY): A light year is equal to exactly 9,460,730,472,580.8 km (9 trillion kilometers), about 5,878,625,373,183.61 statute miles (6 trillion miles), or about 0.3066 parsecs.Venus, Earth, and Mars possess conditions under which there can be remote speculation of living organisms and of these three, only __________ offers conditions compatible with the existence of higher forms of plant or animal life as we know them. :Earth. The possibility of life processes unknown to us cannot be ruled out. With the possible exception of vegetation on Mars, we have no knowledge of any life on other planets of the solar system.Life may abound in the universe or it may be unique to the __________. :Earth. It is not known exactly how life began on our own planet. Therefore, we have no objective means of assessing the probability of life beginning elsewhere or the likelihood of the critical steps of evolution which may lead to intelligent beings.
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