Stars and Solar System Test - 5

Between 1979 and 1999, the farthest planet from the sun was Neptune.

The nearest galaxy to ours is Andromeda which is 2 million light years away from us.

Venus takes maximum time of 243 days for one rotation around its own axis.

Halley is the name of a comet which was first observed by Halley in 1986. It appears once in every 76 years.

The sun was formed from the gravitational collapse of a giant molecular cloud 4.5 billion years ago.

Stars are mainly made up of hydrogen and helium.

Edwin Hubble, an astronomer observed that the galaxies are not stationary but are moving away from each other. The larger the distance between the two galaxies, the faster they move away from each other. This led him to propose and conclude that the universe is expanding.

The pole star is situated in the north along the axis of rotation of the earth and so its position relating to the earth always remains the same.

The live telecast of a cricket match is possible due to geostationary satellite.

The "sea of tranquility" is found on the moon.

A cosmic year is the time taken by the sun to revolve around the Milky Way galaxy.

Though mercury is closer to the sun than Venus, Venus is hotter than Mercury. The reason is that Mercury has no atmosphere and Venus has a thick atmosphere which can retain the heat.

The closely packed part of the comet which contains solid particles, stones and frozen water is called the nucleus.

Mercury has the shortest period of revolution. Hence, it is the fastest planet of the solar system.