Galaxies and the Universe

What is a star?

• A celestial body that generates light through nuclear fission.

• A large ball of gas held together by gravity with a core so hot that nuclear fusion occurs.

• A small rocky object orbiting a planet.

• A bright object in the night sky that is actually a satellite.

What happens when energy leaves a star?

• The star moves closer to Earth

• The star shines

• The star turns into a planet

• The star explodes

Which is the closest star to Earth?

• Proxima Centauri

• Sirius

• The Sun

• Alpha Centauri

What are most stars made up of?

• Oxygen and nitrogen

• Hydrogen and helium

• Carbon and iron

• Silicon and magnesium

What is nuclear fusion?

• A process that occurs when the nuclei of atoms split apart.

• A process that occurs when the nuclei of atoms combine.

• A chemical reaction that produces heat and light.

• A biological process that occurs within living organisms.

What can stars do in a binary system?

• Stars can collide with each other

• Stars can orbit each other

• Stars can merge into a single star

• Stars can become planets

Which of the following planets is not shown in the habitable zone of the Kepler-47 System?

• Kepler-47 b

• Kepler-47 c

• Mercury

• Venus

Which planet in the Solar System is depicted as being closest to the habitable zone?

• Mercury

• Venus

• Earth

• Mars

According to the image, how many planets in the Kepler-47 System are shown within its habitable zone?

• None

• One

• Two

• Three

What is indicated by the green area surrounding the orbits in both the Kepler-47 System and the Solar System?

• Gas giants

• Asteroid belts

• Habitable zones

• Kuiper belts