Stars and their life cycles

An object composed of gas and dust that is undergoing nuclear fusion.

• Galaxy

• Planet

• Star

• Nebula

Process in which two smaller nuclei are joined together to form a larger nuclei.

• Nuclear fission

• Nuclear fusion

• Gravitation

• Condensation

Stars can take different paths due to having different (a)  

• mass
• luminosity
• color
• apparent brightness

______ is a force that causes dust particles to stick together in a nebula.

• nuclear fusion
• gravity
• hydrogen
• iron

As the mass of an object increases, the gravitational attraction between two objects

• Increases

• Decreases

• Does not change

• drops to zero

The ______ of a star determines its life cycle.

• gravity

• mass

• age

• color

A star's temperature determines its ________.

• size

• color

• name

• health

All stars begin their life in a

• Main Sequence
• Nebula
• Protostar
• Black Dwarf

Most stars are made of which elements?

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

After the main sequence, a high mass star becomes a

• black dwarf
• protostar
• red giant
• supergiant