Please helpWhat additional info does the sidebar provide?

The sidebar tells us what Earth scientists are actually doing about the risk of an asteroid impact.

Explanation:

The main part of the page discusses how frequently the moon is hit by rocks;  how most rocks are too small to make it past Earth's atmosphere; how the rocks that do make it all the way to Earth's surface are usually pretty small and don't hit anything important; how screwed we would be if a massive rock – like an asteroid – made it to Earth's surface.

The sidebar says that scientists are understandably worried enough about these asteroids – they "feel the danger is to great to ignore" – so they're keeping a lookout for asteroids that might be on a collision course with Earth.

racism is the belief in the superiority of one race over another, which often results in discrimination and prejudice towards people based on their race or ethnicity. the use of the term "racism" does not easily fall under a single definition.

explanation:

"a" because he is appealing to logic as oppose to appealing to the audience's emotions.