What is a metreroid?

What is a good sentence for chronometer? How many people have walked on the moon altogether? How much money do astronats make? What was Apollo used in todays culture? What is a soace shuttle? What are some metaphors in The Hitchhikers Guide to the Galaxy? How is energy from the core of the sun transmitted to the photosphere? How did Phaethon die? What kind of god his Zeus? Does a solar powered heater work on the dark side of the moon? Water seen early in the morning only on the tip of a blade of grass is due to? Why does earth's shadow often covers the entire moon during a lunar eclipse but only only a small part of the moon's shadow during a solar eclipse? Is a plane mirror flip objects from side to side? What is the 2001 Kennedy half dollar made of? How big is a constellation? The Aurora borealis and Aurora australis occur in which layer of the atmosphere? How are exoplanets named and what is the process behind assigning them their unique names? What zodiac signs are associated with the month of September? Why are cameras useful in astronomy? Why are sunspots darker than the surrounding areas on the sun?