Test: The Earth In The Solar System - 1

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How many planets are there in our solar system?


There are eight planets in the solar system: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune.


The planet known as the Earth twin is________


The Earth and Venus do often get called planetary twins, and this is largely because they are very close to being the same mass. Both the Earth and Venus are rocky planets, which means that they are effectively the same density and so they are also very nearly the same physical size. They also both have significant atmosphere surrounded their surfaces.


Which planet is the only one that support animal and plant life Earth?


The earth is neither too hot nor too cold. It has water and air, which are very essential for our survival. The air has life-supporting gases like oxygen.


Why is the earth as called Blue Planet?


From the outer space, the earth appears blue because its two-thirds surface is covered by water. It is, therefore, called a blue planet.


All the planets move around the sun in an _________


planets pull on each other and the Sun also exerts a gravitational pull on them. This has the effect of squashing orbits that one might expect to be circular in a closed system, as the gravitational pulls act on each other like many hands pulling taffy. Einstein's theory of relativity also plays a role in explaining why planets orbit the Sun in an elliptical fashion, as part of the shape of the orbits is a result of the curvature of space caused by planets acting on the space-time around them.


The polar star indicates the direction to the North.


The Earth spins on its “axis “if we followed this axis out into space from northern hemisphere on Earth, it would point towards a particular star in the sky. Which is known as the ‘North star’ since it sits in the direction that the spin axis from the northern hemisphere of Earth point


Asteroids are found between the orbit of Mars and Jupiter


Early in the history of the solar system, the gravity of newly formed Jupiter brought an end to the formation of planetary bodies in this region and caused the small bodies to collide with one another, fragmenting them into the asteroids we observe today. (refence NASA)


A group of stars forming various patterns is called constellation


A constellation is a group of stars that appears to form a pattern or picture. Constellations are easily recognizable patterns that help people orient themselves using the night sky. There are 88 “official” constellations. Asterisms are also naked-eye star patterns, but they do not form constellations on their own. The Big Dipper is really an asterism, that is, a star pattern that is not a constellation


How many days does it take the earth to revolve around the sun?


Earth revolves around the sun in 365 days, 5 hours, 59 minutes and 16 seconds. The time a planet takes to revolve around the sun is called a year.


A huge system of stars is called Galaxy


A galaxy is a huge collection of gas, dust, and billions of stars and their solar systems