Author Question: If the orbital velocity of an eclipsing binary is 97 km/s and the smaller star is completely ... (Read 82 times)

acc299 · **on:** Jul 27, 2018

If the orbital velocity of an eclipsing binary is 97 km/s and the smaller star is completely eclipsed in 2 hours, what is the diameter of the smaller star?

a. 175,000 km
b. 350,000 km
c. 194 km
d. 700,000 km
e. 4656 km

Question 2

The main reason for building large optical telescopes on Earth's surface is

a. that there is a lot of money in science that needs to get spent.
b. to collect as much light as possible from faint objects.
c. to nullify the blurring effects of the Earth's atmosphere and thus produce higher resolution images.
d. to bring astronomical objects closer to make them brighter.
e. that the warm temperatures of the Earth's surface allow for easier telescope operation.