Exam 15: The Origin of the Solar System

Radiation pressure: light streaming from the Sun's photosphere pushed against the particles of the solar nebula. Large bits of matter like planetesimals and planets were not affected, but low-mass specks of dust and individual atoms and molecules were pushed outward and eventually driven from the system.

Outgassing refers to the formation of an atmosphere by the attraction of gases from the surrounding nebula.

Outside the ice line the temperatures are too warm for ices to condense.

Venus is often called Earth's sister planet because it is similar to the Earth in terms of

All old surfaces in the solar system were heavily cratered during the ________________ period by leftover debris from when the planets formed.

Outgassing is

The uncompressed density of a planet in our solar system

____________ are located beyond the asteroid belt (3 AU) from the Sun, have extremely large masses and very low densities.

The streak seen in the sky against the Milky Way background is a/an _______________.

The Jovian problem is that gas and dust disks may not last long enough for Jovian planets to form by accretion and then by gravitational collapse.

Part of the current atmosphere of Earth is believed to be

Half-life is the time a celestial body has left in its evolution.

The Jovian planets have lower average densities than the terrestrial planets.

List and describe four differences between Jovians and Terrestrials.

Protoplanets of the Jovian planets could have grown very hot from

The condensation sequence cannot explain the composition of the terrestrial and Jovian planets.

The period of the planet orbiting 51 Pegasi is about 9 days.

The diagram below shows the radioactive decay of cesium (135Cs). What is the half-life of 135Cs

Violent impacts of infalling particles release energy called ____________.

A planet is much more massive than the star it orbits.