Astronomy Quiz 06

What two factors keep stars in equilibrium (in balance)?

• gravity and nuclear fusion

• mass and gravity

• nuclear fusion and surface temperature

• surface temperature and luminosity

What does the fusion of hydrogen atoms produce?

• helium + energy

• carbon + light

• iron + heat

• hydrogen + mass

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Where does nuclear fusion occur in the Sun?

• core

• photosphere

• convection zone

• radiation zone

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How does a star lose mass throughout its life?

• Mass is ejected through conduction and radiation.

• The outside of the star is worn away by gravity.

• Mass is converted to energy from nuclear fusion.

• The inside of the star gets compressed into a smaller mass.

Elements heavier than iron are produced when a:

• high mass star undergoes a supernova explosion.

• low mass star becomes a high mass star.

• low mass star fuses with another low mass star.

• high mass star forms a binary star system with another high mass star.

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Which two elements are mostly involved with nuclear fusion in the Sun?

• hydrogen and oxygen

• hydrogen and helium

• oxygen and carbon

• carbon and helium

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When does a star go supernova?

• When the star has used its elements and iron is produced.

• When it becomes a black hole.

• The moment it is born.

• After it has existed about 10 million years.

What happens with mass and energy during nuclear fusion?

• Some energy is lost because of gravity.

• Some mass is lost because of gravity.

• Some mass is lost because it’s converted to energy.

• Some energy is lost because it’s converted to mass.

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According to current theory of the origin of our solar system, why do the orbits of the planets all lie in the same flat plane?

• The Sun’s gravity forced them into these orbits.

• Comets wiped out any not in this plane.

• This happened by chance.

• The early solar nebula flattened into a disk as its rotation increased.

According to current theory used to explain the origin of our solar system, the planets in our solar system:

• were captured into orbit by the Sun’s gravity.

• formed by fusion of hydrogen in their cores.

• formed from the same nebular cloud as the Sun.

• were captured by the solar nebula.