6.4 Nebulae

During a stargazing night, Harper pointed out a beautiful sight in the sky and asked, "What are nebulae?"

• Stars in space

• Clouds of dust and gas in space

• Planets in a solar system

• Exploding black holes

During a stargazing session, Daniel asked his friends about the singular form of the word "nebulae". Can you help him out?

• Nebular

• Nebulus

• Nebula

• Nebulon

During a science project, Benjamin and Anika are studying the composition of nebulae. They want to know what gases are mostly found in these cosmic clouds.

• Oxygen and nitrogen

• Hydrogen and helium

• Carbon dioxide and oxygen

• Hydrogen and oxygen

How far apart are the particles of gas and dust in nebulae?

• Very close together

• Very far apart

• Touching each other

• Constantly colliding

David is studying a nebula the size of Earth. He wonders what its mass would be:

• Several thousand kilograms

• A few kilograms

• Several tonnes

• 10 000 kilograms

How much larger can some nebulae be compared to the Solar System?

• 100 times

• 1 000 times

• 10 000 times

• 100 000 times

What happens to giant stars at the end of their lives?

• They form new solar systems

• They shrink into black holes

• They explode, sending dust and gas across space

• They disappear completely

While stargazing one evening, Liam asked his friends Daniel and Noah which nebula is easiest to see in the northern hemisphere.

• Eagle Nebula

• Orion Nebula

• Carina Nebula

• Crab Nebula

Ethan and Aria are stargazing in their backyard. They want to know when the Orion nebula is visible in the northern hemisphere.

• Summer

• Winter

• Spring

• Autumn

Ava is studying geography and wonders where the northern hemisphere is located.

• South of the equator

• North of the equator

• On the equator

• Around the poles only