Life Cycle of Stars

A star's life begins within a cloud of gas and dust.

• I don't know

• False

• True

As particles within the nebula are pulled closer together, gravitational attraction increases.

• True

• False

• none of the above

Tags

NGSS.HS-PS2-4

A nucleus is an atom’s central region which is made up of neutrons and protons.

• True

• False

• none of the above

Tags

NGSS.HS-PS1-8

Stars begin life in the cores of these dense regions when the process of nuclear fusion begins.

• False

• True

• Maybe

Tags

NGSS.HS-ESS1-1

NGSS.HS-PS1-8

Massive stars really go out with a bang. The remains of a supernova called Cassiopeia are still glowing with energy long after the star exploded.

• True

• False

• I don't know

A nucleus is an atom’s central region is made up of two particles. What are these particles?

• oxygen and carbon dioxide

• neutrons and protons

• helium and electrons

The law of universal gravitation is when all objects in the universe attract one another. The force of gravity increases with increasing mass and decreasing distance between objects. As particles within the nebula are pulled closer together, gravitational attraction increases. As a result, dense regions of gas and dust form within the nebula. The densest regions, which are called dense cores, form new stars. Who formulated this law?

• Newton

• Galileo

• Einstein

Tags

NGSS.HS-PS2-4

A star enters the next stage of its life cycle when nearly all of the hydrogen in its core has fused into helium. The core of the star contracts under its own gravity. This contraction increases the temperature of the core. Energy is transferred to a thin shell of hydrogen that surrounds the core. Hydrogen fusion continues in this outer shell. The ongoing fusion radiates large amounts of energy outward. The outer shell of the star expands, which makes the star grow much larger. When fusion ends completely, stars begin to eject matter. Stars rapidly lose mass until only the core remains. The final stages in a star’s life cycle depend on the mass of the star.

What is the main idea of the paragraph?

• How stars are formed

• When stars collide

• Nuclear Fusion in Stars Stops

Tags

NGSS.HS-ESS1-1

These outward and inward forces balance each other, and the star does not get any larger or any smaller.

What causes these phenomena?

• adjusting

• gravity

• balancing

Tags

NGSS.HS-PS2-4

Giants are red because the surface temperature of the star becomes cooler as the outer shell expands.

• True

• False

• i don't know