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The Big Bang theory is that the 

universe was once in an extremely 

hot and dense state that expanded 

rapidly. (13.7 Billion years ago) 

Terrestrial planets (inner planets) 

is a planet that is composed primarily of 

silicate rocks and/or metals. Within the 

Solar System, the terrestrial planets are 

the inner planets closest to the Sun. The 

terms are derived from Latin words for 

Earth (Terra), so these planets are, in a 

certain way, "Earth-like".

Mercury- The planet Mercury is the closest of 

the planets to the Sun. Billions of years ago, a 

large object crashed into Mercury, stripping 

away its lesser-density material, and leaving 

behind the high-density planet seen today. 

(Highest dense planet in our solar system with 

an iron core) 

Venus is in many ways Earth's evil 

sister planet. It is almost identical in size, 

chemistry, gravity and density as the 

Earth. About 4 Billion Years Venus was 

formed and at the conclusion of forming it 

continued to be bombarded with leftover 

material. Many planets still bear the 

remains of this activity by showing many 

craters on the surface. Activity on the 

surface can act to change the craters.

The Earth being 4.55 Billion years 

old, is the only known planet to 

sustain life in our solar system. This 

rocky planet is the only one in the 

Solar System that is covered with 

liquid water. It also has an 

unusually large satellite for its size, 

as Earth's Moon has about a 

quarter of its diameter. 

Earth was formed from the 

collision of a Mars-sized 

protoplanet. The moon was 

created by this collision. After the 

impact the Earth surface turned 

molten. The heavier materials 

sank to the core and lighter 

materials rose to the surface. The 

earth then cool for a long period 

of time. It then naturally 

developed into the physical 

planet we see today. 

Mars, also known as the Red Planet, is the fourth 

planet in the solar system in order from the Sun, 

and the second lightest. Mars has fascinated 

man since ancient times on account of its red 

color, unique among visible objects in the night 

sky. Mars is half the size of Earth and has about 

11% of earth's mass. The large proportion of 

iron in Mars's clay-like topsoil gives Mars its 

distinctive color. Mars is believed to have luquid 

water under the surface of the planet and is 

reconized as one of the only planets that may be 

able to sustain life, other than earth.

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