You discovered a new galaxy and need to classify it into one of three groups. Based on its shape, what could it be?

• a spiral galaxy
  
  

• an Andromeda galaxy
  

• an elliptical galaxy
  

• an irregular galaxy

Answer explanation

Based on the shape of the new galaxy, it can be classified as a spiral galaxy, an elliptical galaxy, or an irregular galaxy.

Stars are born into huge clouds of gas called

• Nebulae

• Supernovae

• Asteroids

• Comets

Answer explanation

Stars are born into huge clouds of gas called nebulae, making it the correct choice.

Some stars explode into huge gas called:

• White dwarfs

• Supernovae

• Nebulae

• Black holes

Answer explanation

Stars explode into huge gas called supernovae, not white dwarfs, nebulae, or black holes.

Tags

NGSS.HS-ESS1-3

Imagine this, Noah, Abigail, and David! About 10 or 20 billion years ago, the universe played the ultimate magic trick. Poof! Absolutely nothing existed, not even the galaxy, stars, or Earth. Can you believe it?

• True

• False

Answer explanation

The statement is true because about 10 or 20 billion years ago, the universe did not exist, including galaxies, stars, or Earth.

What is a star primarily made of?

• Rock and ice

• Water and air

• Metal and minerals

• Gas and dust

Answer explanation

Stars are primarily made of gas and dust, which undergo nuclear fusion to produce energy and light.

This type of galaxy has no defined pattern or shape

• Spiral 

• Elliptical

• Irregular

• Quasar

Answer explanation

The correct choice is 'Irregular' because this type of galaxy has no defined pattern or shape, making it irregular in nature.

This type of galaxy has pinwheel arms around a bulge in the middle

• quasar

• irregular

• spiral

• elliptical

Answer explanation

Spiral galaxies have pinwheel arms around a bulge in the middle, distinguishing them from other types like quasars, irregular, and elliptical galaxies.

Tags

NGSS.MS-ESS1-2

Our sun is about _______ years old

• 1 billion

• 500 million

• 5 billion

• 10 billion

Answer explanation

The correct answer is 5 billion because the estimated age of our sun is around 4.6 billion years old, making it closest to the given option.

Select the correct order for a star's formation

• 1. Nuclear fusion begins. 2. Gravity pulls gas and dust together. 3. A large cloud of gas and dust exists. 4. A protostar is formed.

• 1. Nuclear fusion begins. 2. A protostar is formed. 3. Gravity pulls gas and dust together. 4. A large cloud of gas and dust exists.

• 1. A large cloud of gas and dust exists. 2. Gravity pulls gas and dust together. 3. A protostar is formed. 4. Nuclear fusion begins.

Answer explanation

The correct order for a star's formation is: 1. A large cloud of gas and dust exists. 2. Gravity pulls gas and dust together. 3. A protostar is formed. 4. Nuclear fusion begins.

A star is ___________ when the contracting gas and dust from a nebula become so dense that nuclear fusion starts.

• born

• erupted

• beginning

• changing

Answer explanation

A star is born when the contracting gas and dust from a nebula become so dense that nuclear fusion starts, making it the correct choice.

Tags

NGSS.HS-ESS1-1