Astronomy - Galaxies and the Sun

Where does fusion occur naturally?

• Underwater

• All around us

• In the radioactive waste

• In the core of stars, like our sun

Which atoms combine together during fusion reactions in a main sequence star like our sun?

• Helium and Hydrogen atoms

• Hydrogen atoms

• Hydrogen and Lithium atoms

• Hydrogen and Carbon atoms

Most stars are made of which elements?

• Hydrogen only
• Hydrogen and Lithium
• Hydrogen and Sodium
• Hydrogen and Helium

__________________ is the process in which two or more smaller nuclei combine to create a larger, more stable nuclei.

• Nuclear Decay

• Nuclear Fission

• Nuclear Fusion

• None of the above

Which force allows for high pressure and temperatures inside the sun?

• Gravity

• Pulling Force

• Magnetic Force

• Electromagnetic

Stars are in which which state of matter?

• Solid

• Liquid

• Gas

• Plasma

What is a huge collection of of gas, dust, billions of stars, planets and other celestial objects?

• A star

• A planet

• A galaxy

• A comet

What type of galaxy is the Milky Way?

• Spiral
• Barred Spiral
• Irregular
• Elliptical

The three main parts of a spiral galaxy include all of the following, EXCEPT...

• The central bulge
• The halo
• The arms
• The disk

What force holds the contents of galaxies together?

• The weak nuclear force
• The electromagnetic force
• Gravity
• The strong nuclear force