__________celestial objects orbit the Sun and often have a visible tail of gas.

Around which of the following object does the comet revolve?

_______ is not related to the solar system.

__________part of the Sun is visible from Earth.

There are _____ planets in the solar system.

We cannot see what is near the center of our galaxy with regular optical telescopes because_______________.

How much time did it take for the formation of the first stars and galaxies after the beginning of the universe?

__________is at the exact center of our galaxy.

What is the difference between the contents of the halo and the disk of our galaxy?

Is it possible to see planets orbiting around other stars with our telescopes?

In the future, by developing advanced microscopes, we can see the planets orbiting around the sun.

The planets move in their respective orbit by_________.

Read the statement and select the correct answer.
Astronomers have found all the galaxies in the observable universe.

When you go out on a dark moonless night and you see thousands of stars with your naked eyes, those ___________.

Which of the following statement is correct?

We are located in __________ part of our galaxy.

How was John able to determine that we were not at the center of our Milky Way galaxy?