The Solar System

Each of the terrestrial planets have a molten, liquid crust.

The Oort Cloud marks the beginning of the solar system.

Scientists infer the solar system began as a cloud of dust, ice, and gas called a(n)

Most craters formed due to impact / volcanic activity.

Energy emitted from the Sun in the form of light and streams of charged particles are known as

Craters / meteorites provide information about the composition of the solar system.

___________ is the coming together of smaller objects in space.

Before the late 1700s, scientists generally did not consider comets to be part of the _______________________.

______ are rich materials that condense mostly at low temps and evaporate quickly at typical Earth temps and pressures.

Protoplanetary disks are young stars surrounded by disks of dust and ice particles.

What model had Earth as the center of the solar system?

The time when exactly half of the starting parent material remains in a sample is called a

About _____________% of the mass of the solar system is found in the sun.

Radioactive decay provides evidence for the age / composition of Earth and other parts of the solar system.

This planet has more than three times its average density.

The inner planets have relatively high average desities, while the outer planets have very low average densities.

Craters / meteorites provide evidence that the planets formed through accretion.