universe

What estimate is the universe’s age

13.79 billion years old

Origin of universe explained by

Big bang theory

Origin of universe explained by

Big bang theory

Who first proposed big bang theory

Geoges lemaitre in 1927

Diameter of solar system ?

9 billion km

How old is our solar system

4.6 billion years

Name of our galaxy

Milky way

The galaxy closets to us

Andromeda (2.5million light years away )

How much is 1 light years

3×10( power 8) m/s

How many planets are there

8

What is axis

An imaginary line pasing through the planet

Earth’s rotation

24 hours ( rotation is one circular movement of the earth around it’s axis )

Earth’s revolution

365 days ( Revolution : earth’s circular movement around the sun )

1) Mercury

0 moons

59 days rotation

88 days revolution

Smallest and closest to the sun

2) Venus

0 moons

243 days rotation

224 days revolution

Hottest planet

Called earth’s twin

Called the morning/evening star

Why is venus called earth’s twin

Because of its same size and shape just like the earth

3) Earth

1 moon

24 hours rotation

365 days revolution

Densest planet

Blue planet ( 71 % water )

Hosts life

4) Mars

2 moons

Called Red planet

24 hours+ rotation

687 days revolution

why is mars called red planet

Because it appears to be red because it contains iron oxide ( rust) in its surface

What are moons of mars called

Phobos and deimos

5) Jupiter

95 moons

10 hours rotation

4332 days rotation

Biggest planet

Biggest moon ( Genymede )

6)Saturn

146 moons ( highest no. Of moons )

10.7 hour rotation

10, 775 days revolution

Second largest planet

Second largest moon : Titan

Saturn has ring system

7) Uranus

28 moons

17 hours rotation

30,681 days revolution

Known as Ice giant

8) Neptune

16 moons

16 hours rotation

60,193 days revolution

Longest time around sun

When was pluto excluded by the list of planets

2006 by International Astronomical Union and was categorised as a dwarf planet

In what types planets are categorised

Inner planets

Outer planets

Inner planets

1 - 4 ( closest to sun and small planets )

Mercury

Venus

Earth

Mars

Outer planets

5-8 ( far from sun and big planets )

Jupiter

Saturn

Uranus

Neptune

Size of sun

109 times the size of earth

Diameter of sun

1.4 million km

How much mass does sun consists of

Sun consists of 99.8 % of the total mass of the solar system

Surface temperature of the sun

5500 - 6000 degree celsius

The sun along with the solar system revolves around?

The centre of our milky way galaxy

Age of earth

4.5 billion years

How earth was formed

Out of the dust and gas leftover from the sun

How did the earth grew

Due to the collision between dust , asteroids and other planets

Moon formed

Due to a giant impact that threw rocks , gas and dust particles from earth

Age of universe

13.8 billion years

Age of solar system

4.6 billion years

In terms of size where does earth fall

5th largest planet earth