Chapter 28 Study Guide - Earth Space

What causes materials to come together to form stars and planets?

• Gravity pulls everything together

• Nuclear fission and the expansion of interstellar gas and dust
• Electrostatic attraction and the expansion of interstellar gas and dust
• Magnetic repulsion and expansion of interstellar gas and dust

What are Planetismals?

• Early planets; formed from colliding particles in the early solar system

• Large, perfectly spherical bodies that formed late in the history of the solar system
• Tiny, star-shaped bodies that orbit around the sun
• Gaseous formations that make up the outer layer of the planets

What causes retrograde motion?

• Solar flares and sunspots
• Caused by Earth and Mars having different orbit lengths

• Changes in the Earth's magnetic field
• The gravitational pull of the moon

What is the Heliocentric model?

• A model that places the Earth at the center of the solar system
• A model that places the Moon at the center of the solar system
• A model that places the Sun at the center of the solar system
• A model that places the Milky Way at the center of the solar system

Who developed the Heliocentric model?

• Johannes Kepler
• Isaac Newton
• Nicolaus Copernicus
• Galileo Galilei

At what position in orbit are planets traveling the fastest?

• January - February

• March - April

• June - July

• December - January

What does high density of the Terrestrial planets tell you about the interior of the planet?

• The interior of the planet is likely composed of light materials such as water and ice.
• The interior of the planet is likely composed of gases and liquids.
• The interior of the planet is likely composed of organic materials.
• The interior of the planet is likely composed of heavy materials such as rock and metal.

Which planet is the densest and the most tectonically active of the terrestrial planets?

• Venus

• Earth

• Mercury
• Mars

The inner planets are known as?

• dwarf planets
• terrestrial planets
• gas giants
• nonterrestrial planets

The outer planets are known as?

• Gas giants
• Ice giants
• Terrestrial planets

• Rocky planets