Stars

A star that burns its nuclear fuel steadily over time is known as...

• a stable star

• a main sequence star

• a primary star

• a supernova

Tags

NGSS.HS-ESS1-1

How many neutrons does a standard hydrogen atom have in its nucleus?

• zero

• one

• two

• three

If a star becomes a red giant after about 1 million years as a main sequence star, is the star small or large?

• small

• large

The magnitude of a star is a measure of its

• temperature

• size

• brightness

• color

This begins when a protostar condenses and reaches critical mass.

• the collapse of the star

• the production of helium

• the protostar becomes a planetary nebula

• a black hole is formed

Deuterium and tritium are special forms of...

• fusion

• helium

• nebulae

• hydrogen

Tags

NGSS.HS-PS1-8

The red giant phase of a star's lifecycle begins when...

• the star's fuel begins to run out

• the star blows out its atmosphere

• a planetary nebula condenses into a protostar

The spectral class of a star is related to its...

• magnitude

• specialness

• size

• temperature

The term "fusion" refers to...

• the combining of two nuclei to form a new element

• the splitting apart of an atom to release energy

• a state of disorder

Tags

NGSS.HS-PS1-8

A brighter star has a higher magnitude than a dimmer star.

• True

• False