2 billion years old, what is the age of the older region?

timer Asked: May 4th, 2015

Question description

 Observers see Bruin occult a star for 25 seconds while it is moving at 20 km/s. Find its diameter by multiplying velocity and time.

he asteroid Bruin has a brightness L = 0.58 and an albedo A = 0.177. Find its radius. R = 136.9 sqrt(L/A).

Find how much brighter is the asteroid when viewing the long side as opposed to when viewing the short side by dividing the maximum brightness by the minimum brightness.

2 billion years old, what is the age of the older region? MARS

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