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Which is the smallest planet in the solar system ?

Mercury
Pluto
Earth
Jupitar

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It is the first and smallest planet in the solar system closest to the sun. It has an orbital period of just 88 Earth days. One more thing to note is that Mercury has no atmosphere, and for this reason its surface has greatest temperature variation as compared to other planets.

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What is the meaning of the word "Astro" ?

Star
Moon
Planet
All above

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In Greek words, astro means star and nomy means law of the stars.

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Which is not true about comets ?

Cometary nuclei are among the least reflective objects found in the Solar System
Carbon mono is contained by Comets
Amino acid glycine is contained by Comets
Because of their low mass, comet nuclei do not become spherical under their own gravity

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Which comet nuclei are among the least reflective objects found in the Solar System.

Asphalt
None
Halleys Comet
Comet Borrelly

HellyComet.jpg

Also known as Comet Halley, it is mostly visible from earth in every 70 to 80 years. It was last seen in 1986 and will now be seen around 2061.

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Which star is nearest to the earth ?

Sun
Sirius A
Sirius B
Centauri

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Yes, Sun is the biggest star in our Solar System. It is in the center of the Solar System. Being 109 times that of Earth in size, its mass is 330,000 times of earth.

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Who gave the theory of gravity ?

Coulomb
Einstein
Edmond Halley
Newton

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Newton gave his theory in 1687 in his published book "Principia". The concept in this book hypothesizes the inverse-square law. According to his law of universal gravitation "The any two bodies can attract each other with a force which is directly proportional to the product of their masses and inversely proportional to the square of the distance between these".

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What is the speed of light in a perfect vacuum ?

299,792,458 metres per second
399,792,458 metres per second
499,792,458 metres per second
599,792,458 metres per second

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What is the estimated Diameter of Milky Way Galaxy ?

10,000 light years
100,000 light years
1,000,000 light years
10,000,000 light years

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How many stars are estimated in Milky Way Galaxy ?

MilkyWay.jpg
50–100 billion stars
100–200 billion stars
200–400 billion stars
500–900 billion stars

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What is the estimated age of Milky Way Galaxy ?

10.2 billion years
11.2 billion years
12.2 billion years
13.2 billion years

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It is estimated to be about 13.2 billion years old, nearly as old as the Universe.

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