Exam 12: Asteroids, Comets, and Dwarf Planets: Their Nature, Orbits, and Impacts

When a comet passes near the Sun,part of it takes on the appearance of a large,bright ball from which the tail extends.This part is called

Explain how astronomers determine the size of an asteroid without resolving it.

Pluto is the largest Kuiper Belt Object.

Why didn't a planet form where the asteroid belt is now located?

Meteorites can come from

When was Pluto discovered?

Halley's comet is named after the English scientist Edmund Halley because he

How does the largest asteroid,Ceres,compare in size to other solar system worlds?

The total mass of the Kuiper belt is greater than that of the asteroid belt.

Why do asteroids and comets differ in composition?

According to current evidence,Pluto is best explained as

Why does the plasma tail of a comet always point away from the Sun?

Comet nuclei can be darker than charcoal.

A rocky leftover planetesimal orbiting the Sun is

All asteroids are spherical solid objects,similar to the Moon and Mercury,just much smaller.

Which of the following is not a piece of evidence supporting the idea that Pluto is a large comet of the Kuiper belt?

The discovery of Eris

Where did comets that are now in the Oort cloud originally form?

On average,how often do impactors about 10 km in size,large enough to produce mass extinction,hit Earth?

When do comets generally begin to form a tail?