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:

A. the cloud is much hotter than hydrogen on Earth
B. the cloud is moving away from us
C . the cloud is moving toward us
D. the cloud is much cooler than hydrogen on Earth

Apossible explanation for a set of facts that can be tested by further investigation is called

Waves that cause the most damage during an earthquake are a. surface waves c. s waves b. p waves d. ocean waves

Imagine that you have two balloons (or, better yet, actually inflate two balloons, if possible). create static electricity around one of the balloons by rubbing it against your hair or your sweater and then bring that balloon close to the other balloon, which has not been charged. try this with at least one other object—and for variety in the discussion, avoid using an object already described by your classmates. then, for your initial post to the discussion, answer the following questions: what happened with the two balloons?