Dysnomia Nix Namaka Charon Hydra Hi'iaka Pluto Makemake Eris Haumea Weywot Vanth 2007 OR10 Sedna Quaoar Orcus

Suppose the average mass of each of 20,000 asteroids in the solar system is 1017 kg. Compare the total mass of these asteroids to the mass of Earth. Assuming a spherical shape and a density of 3000 kg/m3, estimate the diameter of an asteroid having this average mass.

The planet Uranus was discovered in 1781, and Neptune, the next planet outward from the Sun, was discovered in 1846. Imagine you're an astronomer in 1846, and you start wondering if there's another planet out beyond Neptune. You decide to try and discover its existence using the same method that was used for Neptune. How will you do this? Group of answer choices You'll recruit a large number of astronomers to use their telescopes to carefully scan the sky in directions that are far from the ecliptic. The regions around the north and south celestial poles will probably be the best "hunting grounds" for the new planet. You'll examine Uranus and Neptune very carefully, on every clear night, for several years, to see if you can find any evidence that sunlight has been reflected off of the `new' planet, then off of Uranus or Neptune, before arriving on Earth. On rare occasions when Neptune passes in front of the Sun, as seen from Earth, you'll look carefully at the Sun (with a safe…

Assume there are a million asteriods 1 kilometer across or larger in the asteroid belt. Assume all asteroids are perfectly spherical.  1) If a million asteroids 1-kilometer across were all combined into one spherical object, how big would it be across?  2) How many 1-kilometer diameter asteroids would it take to make an object as large as Earth?