Stars and Nebulae

Which of the following is not a stage for a low mass star?

• Protostar evolves
• Main sequence
• Red giant
• Red dwarf

Which is a similarity between medium and high mass stars?

• planetary nebula
• helium fusion
• Types II supernova
• white dwarf

A cloud fragment too small to form a star becomes a ...

• red giant
• black hole
• brown dwarf
• red dwarf

Most stars develop from very massive nebulae called...

• giant molecular clouds
• protostars
• red giants
• planetary nebulae

When a young, developing star becomes massive enough and dense enough, the process of _______ begins.

• H --> He fusion
• He --> C fusion
• He --> C --> O fusion
• fission

When stars are fusing hydrogen into helium, and are neither expanding nor contracting, they are said to be...

• dying
• in hydrostatic equilibrium
• white dwarfs
• red hypergiants

When a large enough mass of instellar gas compresses, it begins to rotate.  At this point, a __________ has formed.

• giant molecular cloud
• protostar
• red giant
• planetary nebulae

Which type of star has the longest life span?

• A star of 10 solar masses
• A star of 1 solar mass
• A star of 0.1 solar masses
• A star of 50 solar masses

The smallest main sequence stars are called...

• red dwarfs
• white dwarfs
• green dwarfs
• red giants

The smallest, densest stars in the universe are called...

• protostars
• white dwarfs
• neutron stars
• main sequence stars