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Hobbies & interests

By Mohan Babu



1) Name the solar system planet with the hottest surface temperature

2) Name the famous cloud in solar system that is believed to be the source of most long period comets and periodic comets.

3) What is an Exoplanet?

4) Moon has a large number of impact craters on its surface. Why is Earth impacted less by asteroids, meteoroids and asteroids as compared to Moon?

​5) In a crescent Moon, part of the Moon is lit by Moon and the balance area is unlit. Yet we can see a faint glow in the unlit portion of the Moon. What is this phenomenon called?

6) One of the planets in the solar system is so light that it can float on water. Which planet is that?

7) What is a supernova?

8) What is the perihelion for a planet?

9) Galileo Galilei is considered the Father of observational astronomy. Which country did he belong to?

​10) Name the Newton's book that is considered the most influential one on Physics and astronomy.

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1) Venus is the solar system planet with the hottest surface temperature. It is a surprise that Venus is hotter than Mercury, which is closest to Sun. Venus is hotter because of the greenhouse effect caused by its dense atmosphere.

2) Most comets are expected to originate from a hypothetical region in solar system called Oort cloud. This cloud is yet to be confirmed through observations. Oort cloud sadly does not bring any rainfall to us.

3) An Exoplanet is a planet discovered outside our solar system. Even with our most powerful telescopes, it is difficult to see the planets around other stars. So the astronomers use several indirect methods to discover these Exoplanets. There is a slight dimming of the light from the star when a planet comes in front of the star. So the dimming is possibly an indication for an Exoplanet.

​4) The atmosphere of Earth serves as a cushion by burning most asteroids and meteoroids before it hits the surface of the Earth.

5) It is called the Earthshine. Moon's surface in the shadow region glows slightly as it reflects back the light received from Earth.

6) Saturn has a density that makes it lighter than water. So technically it can float on water. It is a different issue we may not find that much of water to let Saturn float on it.

7) Supernova is an explosion of a dying red giant star that has run out of fuel. This leads to a gravitational collapse followed by a spectacular explosion.

8) A planet orbits around the Sun in an eliptical orbit. When the planet gets closest to the Sun, it is called its perihelion point.

9) Galileo Galilei is an Italian Physicist and astronomer.

10) Newton's Philosophiiea Naturalis Principia Mathematica is considered the most influential book ever written in Physics. If someone answers Principia Mathematicia, that can also be considered correct.

There are plenty of little facts that make astronomy an interesting subject. It is exciting to know about a planet that can float on water or a cloud that does not bring rain. We should keep asking question and that is the only way to learn. There is so much more to know about the universe. So take the following quiz and let the learning continue.

Astronomy facts