Question

We observe a glowing cloud of gas in space with a spectroscope. We note that many of the familiar lines of hydrogen that we know on Earth seem to be in a different place. They are shifted toward the blue or violet end of the spectrum compared to their positions in the spectrum of glowing hydrogen gas on Earth. From this we can conclude that

Answer 1

The cloud is moving toward us.

Step-by-step explanation:

When objects are in space or air, and this is true for most objects in the universe, they move in relation to the sun or their movement can be recorded in relation to the sun. As the object moves away from the sun, the wavelength decreases. This causes a shift in the spectrum mainly towards blue or violet. Here, this is clearly mentioned in the given statement. This mean that the object or cloud is moving towards us.