Hubble's 26th Anniversary and the Bubble Nebula

What is the significance of the Bubble Nebula in the context of Hubble's 26th anniversary?

• It was chosen to celebrate the anniversary.

• It was the first image taken by Hubble.

• It is the closest nebula to Earth.

• It is the largest nebula discovered by Hubble.

Why does the material ejected from the star glow more on one side?

• The star is closer to Earth on that side.

• The material is moving faster on that side.

• The material is denser on that side.

• The star is hotter on that side.

What happens to the material ejected towards the less dense side?

• It glows more brightly.

• It moves slower.

• It travels further without glowing.

• It forms a new star.

How does the lifespan of a massive star compare to that of the Sun?

• Massive stars have a similar lifespan to the Sun.

• Massive stars do not have a defined lifespan.

• Massive stars live longer than the Sun.

• Massive stars live much shorter lives than the Sun.

What is the minimum mass required for a star to become a supernova?

• 0.5 times the mass of the Sun

• 50 times the mass of the Sun

• 1.4 times the mass of the Sun

• 10 times the mass of the Sun