Unit 1: Sun - Test Study Guide

The Sun produces energy through:

• Nuclear fission

• Nuclear fusion

• Radiation reflection

• Chemical reactions

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The process of fusion combines:

• Helium and oxygen

• Hydrogen and hydrogen

• Hydrogen and helium

• Carbon and oxygen

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Which type of solar radiation makes up the largest percentage?

• Visible light

• Infrared radiation

• Ultraviolet radiation

• X-rays

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Earth’s axis is tilted at:

• 0°

• 15°

• 23.5°

• 45°

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Kepler’s First Law states that planets move in:

• Circles

• Ellipses

• Spirals

• Parabolas

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The point where Earth is closest to the Sun is called:

• Aphelion

• Perihelion

• Solstice

• Equinox

The solar system began as a large cloud of gas and dust called the:

• Galaxy

• Solar nebula

• Asteroid belt

• Black hole

The solar system formed about:

• 1 million years ago

• 460 million years ago

• 4.6 billion years ago

• 13.7 billion years ago

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Which planets are small, rocky, and dense?

• Jovian planets

• Terrestrial planets

• Dwarf planets

• Gas giants

The modern nebular hypothesis explains:

• Earth’s magnetic field

• Formation of the solar system

• Evolution of stars

• Plate tectonics