Stars - flocabulary

Which of the following best describes a nebula?

• a cloud of adult stars that floats through space where protostars are born

• a fixed system of stars where supernovas form neutron stars

• a cloud of dust and gas that floats through space where protostars are born

• an infinitely dense cloud of dust that floats through space and contains black holes

What triggers the birth of a star?

• A disturbance in a nebula causes its center to begin collapsing from gravity.

• Dust becomes denser in a nebula, forming a star’s core.

• A nebula floats within the field of another star and brings in additional hydrogen.

• A red dwarf collides with a larger star, causing the star to break apart.

True or False: It could take 50 million years for a protostar to become an adult star.

• true

• false

Hydrogen atoms bond to create a new star in a process called

• supernova fusion.

• nuclear fusion.

• hydrogen collapse.

• protostar.

Tags

NGSS.HS-ESS1-1

NGSS.HS-PS1-8

Which of the following best describes the relationship between red dwarfs and giant stars?

• Red dwarfs are less common than giants and live longer.

• Red dwarfs burn energy faster than giants and have shorter lives.

• Red dwarfs burn energy slower than giants and live longer.

• Red dwarfs are more common than giants and have shorter lives.

The sun is ________ star.

• a white dwarf

• the hottest known

• the largest living

• an average-sized

Which of the following best describes the death of a red dwarf?

• Hydrogen burns up in the star’s core, while the star remains at the same temperature. The layers of the star condense, and the star becomes a white dwarf.

• Hydrogen expands in the star’s core, and the star begins to grow. As layers of the star expand, the star becomes a supergiant.

• Hydrogen burns up in the star’s core, and the core begins to cool. The layers of the star loosen up, and the star becomes a white dwarf.

• Hydrogen burns up in the star’s core, and the core begins to freeze. The layers of the star expand, and a chemical reaction causes a supernova.

True or False: A supernova occurs every time a star dies.

• true

• false

Which of the following is true of black holes?

• They have a strong gravitational pull.

• They are less dense than the sun.

• They are created by a nebula.

• They are a type of galaxy.

Tags

NGSS.HS-PS2-4

Neutron stars are the result of

• collapsing nebulas.

• red dwarf expansion.

• protons and electrons combining.

• neutrons emitting from a white dwarf.