Questions And Answers On Solar System

Question: How many planets are there in our Solar System?


Answer: Eight

Explanation: After Pluto was excluded, our Solar System now has Eight planets.

Question: Which is the closest planet to the Sun?


Answer: Mercury

Trivia: Mercury takes only 88 days to orbit the sun.

Question: Which are the Inner planets?


Answer: Mercury, Venus, Earth and Mars

Explanation: The inner planets are the ones that lie between the Sun and the Asteroid Belt.

Question: Which are the Giant Planets?


Answer: Jupiter, Saturn, Uranus and Neptune

Explanation: Jupiter, Saturn, Uranus and Neptune are known as the Giant Planets. They lie beyond the asteroid belt.

Question: Which planets have the Ring System?


Answer: Giant Planets

Explanation: The Giant Planets: Jupiter, Saturn, Uranus and Neptune all have a ring system around them. These solid rings are mostly made up of Dust and other debris.

Question: In the Geocentric model, the celestial bodies in the solar system revolve around what?


Answer: Earth

Trivia: Up until the 16th century, people believed Earth to be the centre of the universe. Geocentric model was the assumed structure of the solar system till the 16th century. Nicolas Copernicus' 'Revolutions of the Heavenly Bodies' began the change in understanding to a scientifically accurate Heliocentric system, where all the planets revolve around the Sun and the Earth was not the centre of the universe.

Question: How long does it take the light from the Sun to reach Earth?


Answer: 8.3 minutes

Explanation: It takes light about 8.3 minutes to travel from the Sun to the Earth.
Trivia: For the same light to reach Neptune, the farthest planet, it takes about 4.1 hours.

Question: Does Moon emit its own light?


Answer: No

Explanation: Only stars produce their own light. The Moon merely reflects the light from the Sun. Only 3 to 12 percent of the sunlight is reflected by the Moon.

Question: How old is our Sun?


Answer: 4.6 billion years

Explanation : Sun was the first in the solar system to be formed, followed by all the planets.

Question: Which is the Hottest Planet?


Answer: Venus

Explanation: Though Venus is the second planet from the Sun, it is the hottest in our solar system. The carbon rich atmosphere acts as a greenhouse, trapping heat, resulting in an average temperature of 462 C or 864 F.

Question: Which is the largest planet?


Answer: Jupiter

Explanation: Jupiter is so huge that it can fit 1300 Earths inside it.

Question: Which is the Smallest planet in our Solar system?


Answer: Mercury

Trivia: Mercury is the second most densest planet in the Solar System, after Earth.

Question: Which is the largest Moon in our solar system?


Answer: Ganymede

Trivia: Ganymede is one of the four Moons of Jupiter discovered by Galileo Galilei. There are 53 official Jupiter Moons discovered till date.

Question: Approximately how long does it take earth to complete one orbit around the Sun?


Answer: 365 days

Explanation: Earth takes 365 and 1/4 days to complete one orbit around the Sun. The quarter days are added up as an extra day in the leap years, every four year.

Question: What is a light-year?


Answer: It's a distance travelled by Light in one year

Explanation: Light Year is an astronomical unit, equivalent to the distance that light can travel in a year. This measures to 9.48*10^12 km.

Question: What is a terrestrial planet?


Answer: Planet made up of rocks or metals with a hard surface

Explanation: The inner planets Mercury, Venus, Earth and Mars are called Terrestrial planets. Their core is mostly made up of Iron and the surface is hard.

Question: What are the Gas planets mostly made up of?


Answer: Hydrogen and Helium

Trivia: Gas planets like Jupiter and Saturn are also known as failed stars, as they have a similar gaseous composition but aren't massive enough for the internal pressure to start a nuclear fusion reaction.

Question: Are Constellations part of the Solar System?


Answer: No

Explanation: Constellations are groups of stars that form a pattern in the sky. But, these stars lie far away from our Solar System. The only Star in our Solar System is the Sun.

Question: Where is the Asteroid belt located?


Answer: Between Mars and Jupiter's orbit

Explanation: During the formative years of the Solar System, there were of bits and pieces of rocks that were left behind called the Asteroid. These rocks now orbit in the space between Mars and Jupiter in millions, known as the asteroid belt.

Question: Where is Kuiper Belt?


Answer: Beyond the orbit of Neptune

Explanation: Kuiper Belt is similar to the Asteroid Belt but the objects are made up of low boiling point elements like Methane, Ammonia and Water.
Trivia: Pluto, the dwarf planet lies in the Kuiper Belt.