Obj. 1.1 Review

What were the small bodies that collided and stuck together to form planets called?

• Asteroids

• Comets

• Meteoroids

• Planetesimals

What theory explains the formation of the solar system?

• Big Bang theory

• Solar nebula theory

• Steady state theory

• String theory

What type of planets are Uranus and Neptune classified as?

• Gas giants

• Dwarf planets

What is the early stage of a star's formation called?

• White dwarf

• Red giant

• Protostar

• Black hole

What is the second most abundant element in the Sun?

• Oxygen

• Carbon

• Nitrogen

• Helium

What is the term for the rocky planets closest to the Sun?

• Gas giants

• Terrestrial planets

• Ice giants

• Dwarf planets

What is the term for the cloud of gas and dust that eventually formed the Sun and planets?

• Comet tail

• Solar nebula

• Asteroid field

• Meteor shower

What process powers the Sun and allows it to shine?

• Nuclear fission

• Nuclear fusion

• Radioactive decay

• Chemical reaction

What is the flattened, rotating disk of gas and dust surrounding a young star called?

• Asteroid belt

• Kuiper belt

• Protoplanetary disk

• Oort cloud

What were the small bodies that collided and stuck together to form planets called?

• Stars

• Galaxies

• Black holes

• Planetesimals