Questions asked about Planet in UPSC exam
Q. Which is the fastest planet ?
A. Mercury, which orbits the Sun at an average distance of 57,909,200 km and has a period of revolution of 87.97 days, is the fastest planet with an average speed of 172,248 km per hour in the orbit.
Q. Which planet is farthest from the Sun?
A. Neptune is the farthest planet from the Sun. When it comes closest to the Sun, it is 4.45 billion km away. The aphelion distance of Neptune from the Sun is 4.54 billion km.
Q. Which is the biggest Asteroid ?
A. The first asteroid discovered, 1 Ceres, is the biggest asteroid with an average diameter of 585 miles.
Q. Which is the biggest Comet ?
A. Centaur 10199 Chariklo, which was discovered in May 1997, is the biggest comet with a diameter of 260 km.
Q. Which is the biggest Constellation ?
A. The biggest constellation is Hydra (Sea Serpent). It covers an area of 1,302.844 sq. deg., or 3.16% of the whole sky, and contains at least 68 stars visible to the naked eye.
Q. What is the biggest Star ?
A. The M-class supergiant Betelgeuse (alpha Orionis), which is 430 light years away from the Earth, has a diameter of 609 million miles—700 times greater than that of the Sun.
Q.Which is most luminous object in the sky ?
A. The most luminous object in the sky is the quasar HS1946+7658, which is at least 1.5 X 1015 times more luminous than the Sun.
Q. What are the Sun’s spots ?
A. The Sun’s spots are regions in the Sun’s photosphere and are visible on the Earth as irregular dark patches scattered on either side of the Sun’s equator. These regions appear to emit strong magnetic field which disturbs wireless communication. Such disturbances cause magnetic storms on the Earth.
Q. Explain the production of halos round the Moon or the Sun.
A. The luminous ring which is seen round the Moon or the Sun occasionally is called the halo. It is caused by the refraction of light by ice crystals present in the atmosphere.
Q. How many planets are there in the Solar System ? Give their names.
A. With the omission of Pluto from the Solar System by International Astronomical Union (IAU) in August 2006, there are now eight planets known to exist in the Solar System. In the order of their nearness to the Sun, they are: (1) Mercury, (2) Venus, (3) Earth, (4) Mars, (5) Jupiter, (6) Saturn, (7) Uranus and (8) Neptune.
Q. Name the largest, smallest and brightest planets in the Solar System.
A. Largest Planet: Jupiter with an equatorial diameter of 142,880 km is the” largest planet.
Smallest Planet: The smallest known planet is Mercury with a diameter of 4,878 km.
Brightest Planet: Venus is the brightest planet.
Q. Which planet is closest to the Earth ?
A. Venus is the planet closest to the Earth.
Q. Which are the hottest and the coldest planets ?
A. Venus, which has a surface temperature of 462°C (864°F), is the hottest planet.
Neptune, with an estimated surface temperature of —212°C (—350°F) is the coldest planet in the Solar System. Uranus also has approximately the same surface temperature