A scientist studying the Milky Way galaxy notices a bright light in the sky. What information would she need to prove that the object is a comet and not a star? Does the object move?
Is there gas in the object?
How big is the object?
Are there other objects orbiting it?
(2 points)

II only

III only

I and II

I and III

Ist and second

Hope it helps

a high pressure system is a dense air mass that is usually cooler and drier than the surrounding air. a low pressure system is a less dense air mass that is usually wetter and warmer than the surrounding air.

in general, areas that experience high atmospheric pressure also experience fair weather. low pressure systems can cause the formation of clouds and storms. air usually flows from areas of high pressure to areas of low pressure..

the duration of a photographic flash is related to an rc time constant, which is 0.100 μs for a certain camera.