UNIVERSE
SOLAR SYSTEM FORMATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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So we know precisely how large or small something is.
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We need to know exactly how heavy the planets are.
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So we can see something very large all at once.
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It allows the solar system to look organized.
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Detailed explanation-1: -Most notably, Earth is unique in that most of our planet is covered in liquid water, since the temperature allows liquid water to exist for extended periods of time. Earth’s vast oceans provided a convenient place for life to begin about 3.8 billion years ago.
Detailed explanation-2: -When measured in astronomical units, the 886, 000, 000-mile (1, 400, 000, 000-kilometer) distance from the Sun to Saturn’s orbit, is a much more manageable 9.5 AU. So astronomical units are a great way to compress truly astronomical numbers to a more manageable size.
Detailed explanation-3: -Astronomers use many of the same units of measurement as other scientists. They often use meters for length, kilograms for mass, and seconds for time. However, the distances and sizes in the universe can be so big, that astronomers have invented more units to describe distance.
Detailed explanation-4: -The most common is to measure the apparent angular diameter of the planet – how big it looks against the sky – very precisely using a telescope. Combining this with a measure of its distance (deduced from its orbit around the Sun) reveals the planet’s actual size.