The shooting lines seen at clear nights are called................

• comets.

• meteors.

• meteoroids.

• meteorites.

....................are huge rocky masses that fall from the space and reach the Earth's surface.

• Meteorites

• Comets

• Asteroids

• Meteors

The mass of the biggest meteorite found up till now reaches.............. tons.

• 100

• 80

• 50

• 10

Comets, asteroids and meteors revolve around the..........

• Earth.

• Moon.

• Sun.

• Jupiter.

Comets revolve around the Sun in fixed.....................orbits.

• circular.

• elliptical.

• curved.

• square.

The comet consists of................................

• frozen gas only.

• ice only.

• rocky parts only.

• rocky and icy particles and water.

The head of the comet consists of a mixture of solidified gases, which are................. gases.

• oxygen, nitrogen and carbon dioxide

• hydrogen, helium and methane

• oxygen, helium and nitrogen

• carbon dioxide, nitrogen and methane

.................comet is the most famous one.

• Galileo's

• Halley's

• Newton's

• Nobel's

Halley's comet completes its orbit around the Sun each..............

• 68 years.

• 76 years.

• 76 months.

• 21 years.

What is this emotion?

• Hot

• In Love

• Sad

• Angry