question 2a please Part 2 – Mass of the Milky Way GalaxyIf we assume the orbit of the Sun is a perfect circle, then we can use Newton's version ofKepler's Third Law to determine the mass of our galaxy. To do this, we need to know thedistance from the center of the galaxy, a, and the Sun's orbital period, P.1. From Part 1, we know that a= 2.57×10'7 km. The orbital period can be found using2παP =vHere v is the orbital velocity (speed) of the Sun about the center of the Milky Way. Itsvalue is known as v = 251 km/s = 7.92×10° km/year. Using this information and theformula above calculate the period of the Sun's orbit in years.203,782,828.3P =years.2. In your opinion, is this a large amount of time or a small amount of time? To help thinkabout this, answer the following questions:a. The first modern humans, known as Homo sapiens, appeared on Earth about 3×10years ago (300 thousand years ago). Based on your finding above, has the Suncompleted one orbit during this time?

Given: The orbital period of the sun: P=203782828.3 years Human appeared t = 3×105 years ago We need…

Answered: In your opinion, is this a large amount…

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