SMALL BODIES IN UNIVERSE

Why was Pluto ultimately reclassified as a dwarf planet?

• Due to the discovery of asteroids.

• Due to the discovery of Ceres.

• Because it was made of only gas.

• Due to the discovery of Eris.

What is the IAU's definition of a dwarf planet?

• Any object that isn't big enough to be rounded by its own gravity.

• A celestial body that orbits another celestial body.

• A celestial body in direct orbit of the sun that is massive enough to form an ellipsoid shape from its gravitational force, but has not cleared its neighborhood from other objects.

• A celestial body that is larger than a planet.

What are bodies large enough to have cleared the neighborhood of their orbit called?

• Planets

• Asteroids

• Comets

• Moons

What are small rocky objects with gravity known as?

• Planets

• Stars

• Asteroids

• Galaxies

Which dwarf planet does not reside in the Kuiper belt?

• Eris

• Ceres

• Haumea

• Makemake

In what decade was Pluto's designation as a planet first called into question?

• The 1970s

• The 1990s

• The 1960s

• The 1980s

How many dwarf planets do astronomers believe they will find in the solar system in the future?

• Under 100

• Over 10

• Over 1000

• Over 1,000,000

This is a celestial body orbiting around the sun that isn't a satellite of a planet and one that is massive enough to form a more-or-less spherical shape but not massive enough to clear away all or almost all other bodies in the vicinity of its orbit:

• Small planet

• Giant planet

• A planet like Earth

• Dwarf planet

These are small planetary bodies whose orbits are found beyond the orbit of Neptune:

• Peri-Neptunian Objects

• Intra-Neptunian Objects

• Trans-Neptunian Objects

• Para-Neptunian Objects

Which region of space, filled with small, icy bodies, is found starting about 30 AU (just beyond the orbit of Neptune) from the sun?

• Pluto belt

• Kuiper belt

• Martian belt

• Asteroid belt