I can't remember too clearly but if I am correct, it would Horatio Gates.
Answer:
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.
Answer:
Ophelia agrees to keep Laertes' advice as a “watchman” close to her heart but urges him not to give her advice that he does not practice himself. Laertes reassures her that he will take care of himself.
