Star Formation and Distance

After a protostar has progressed in its development, it will have a dense inner part and an outer envelope called a(n) ____.

• outer-protostar

• Bok globules

• cocoon nebulae

• ​planetary nebulae

One trigger that could start the gravitational contraction of a molecular cloud to form stars is a passing shock wave.​

• True

• Falso

One of the major star forming regions in space is the Orion Nebula.​

• True

• False

How do single stars form within huge clouds of interstellar gas and dust?

• Clouds fragment into smaller objects, forming many stars at one time.

• One star forms; other matter goes into planets, moons, asteroids, & comets.

• Clouds rotate & throw off mass until only enough is left to form one star.

Objects more massive than our Sun form into stars

• much slower, over billions of years.

• in about the same time.

• much faster, over tens of thousands of years.

• not at all – they are unstable.

Stars are often born within groups known as

• clans.

• spiral waves.

• aggregates.

• clusters.

• swarms.

Very young stars in small clusters of 10–100 members are known as

• OB associations.

• molecular cloud complexes.

• aggregates.

• globular clusters.

• hives.

What cloud formation are stars born in?

• Nursery

• Oort cloud

• Kuiper Belt

• Nebula

What is the initial stage of star formation called?

• Main Sequence

• Red Giant

• Protostar

• White Dwarf

Which of the following is a method used to measure the distance to nearby stars?

• Parallax

• Redshift

• Spectroscopy

• Doppler Effect