What are two main components that make up stars?

• rock and gas

• gas and plasma

• plasma and dust

• rock and dust

A star's color is based on which of the following factors?

• Size

• Mass

• Surface Temperature

• Density

Which of the following is NOT a characteristic used to classify stars?

• Color
• Temperature
• Size
• Shape

The hottest stars are which color?

• orange

• yellow

• white

• blue

Felix examined several photos of stars. To compare their temperatures, he looked at the colors of the stars. He organized the photos in order from coolest to hottest. Which of these answers shows the correct order?

• red, yellow, white, blue

• white, blue, yellow, red

• yellow, white, blue, red

• blue, yellow, white, red

Why do we say that wormholes theoretically exist?

• We do not have a big enough telescope to see a wormhole

• Wormholes can only exist in other galaxies

• Wormholes have not been yet discovered

• It is only fictional and not mathematically possible

Wormholes can transport you from not only one location to another, but also one time to another.

• True

• False

What is a black hole?

• an empty area space with no matter or gravity

• a great amount of matter packed into a small area.

• a celestial body moving in an elliptical orbit around a star

• an astronomical object consisting of a luminous spheroid of plasma held together by its own gravity

How do black holes form?

• Planets exploding

• Extremely large stars colapsing when they die

• Stars getting hit by an astroid

• Tiny stars exploding due to too much heat

Which of the following methods is used to find black holes?

• by sending space probes to the black holes to photograph their findings

• by observing the behavior of surrounding objects like stars or nearby planets

• by using microwaves and x-ray signals

• By using powerful telescopes specifically designed to detect black holes