We want to know a lot about everything. Hi we are a second grade class in San Jose, Ca. We want to know a lot about everything. I don't 'do' planetary astronomy, instead I study how galaxies like our Milky Way were formed and try to find clues to what went on. Your kids always come prepared and ask thoughtful questions.
Astronomers find interesting things all the time.
Jupiter's core region may contain a rocky nucleus with about 12 times the mass of the earth in it, but its surrounded by a dense hydrogen mantle 50,000 degrees hot or more. Instead we think of 'interplanetary', 'interstellar' and 'intergalactic' space when we refer to things in the universe at different distances from us. Not quite what we want to call a planet, and about the third or fourth largest asteroid we know about. We dont really know yet. We have to go to lunch.