Universe

What is a light year?

• The distance light travels in one year.

• The distance between Earth and the Sun.

• The distance between Earth and the Moon.

• The speed of light in one year.

What is the approximate size of the known Universe in light years?

• 100 light years.

• 46,500 million light years.

• 1 trillion light years.

• 10 light years.

Earth is the center of the Universe.

• True

• False

What is the approximate diameter of galaxy IC 1101?

• 100,000 light years.

• Six million light years.

• One thousand light years.

• One trillion light years.

Dark matter represents approximately 27% of the matter in the Universe.

• True

• False

• Unknown

• Depends on the study

What is a black hole?

• A region of space with a gravity field so large that nothing can escape from it.

• A star that emits intense light.

• A very large asteroid.

• A distant galaxy.

Asteroids are rocky objects that orbit around the Sun.

• True.

• False.

What does a black hole emit that helps detect it?

• High-energy particles.

• Radio waves.

• Visible light.

• X-rays.

Dark matter does not emit any type of electromagnetic radiation.

• True.

• False.

• Unknown.

• Depends on the type of dark matter.

What are stars?

• Giant planets.

• Large holes in space.

• Celestial bodies that emit radiation due to nuclear fusion reactions.

• Very bright meteorites.