The Earth In The Solar System Flashcards
(23 cards)
Amavasya
New Moon
Poornima
Full Moon
Why we can’t see Moon and tiny bright objects during noon
Sun’s bright light doesn’t allow us to see these objects in noon whereas we can see these in night
Celestial Bodies
The sun, the moon and all those objects shining in night sky.
Stars
Celestial bodies which have their own light and heat, which they emit in large amounts are called Stars.
Eg- Sun
Why don’t we feel heat of others stars like sun
Those countless twinkling stars are because they are very very far away from us.
Twinkling Bright objects
Stars
Non twinkling Bright objects
Moon and other similar celestial bodies.
Constellations
Various patters formed by different group of stars, these are called constellations. Eg- Ursa Major or Big Bear.
Saptarshi
A group of seven stars which forms part of Ursa Major Constellation
Pole Star
Also Known as North Star, it indicates North direction. It always remains in same position in night sky, we can locate it with help of the Saptarishi. Am imaginary line joining pointers stars (Saptarishi) when extended further meets Pole Star.
Satellites
Companion of planets which moves around the planets is called Satellites.
Distance of planets from Sun (closest to farthest)
Mercury Venus Earth Mars Jupiter Saturn Uranus Neptune
Orbits
All eight planets moves around sun in fixed paths, these paths are elongated. They are called Orbits.
Geoid
Earth like shape
Earth
Third closest planet to Sun, it is slightly flattened at poles. Its shape is described as Geoid.
Shape of Earth
Oblate spheroids. Flattened at poles, bulge at equator.
How many days Moon take to complete one revolution around Sun.
27 days
Moon
Closest celestial body to earth, it’s diameter is 0.25 times that of Earth. Moon have similar features like Earth for example Mountains, plains and depressions.
Asteroids
Numerous tiny bodies which moves around the sun in our solar system, known as Asteroids.
Found between orbits of Mars and Jupiter.
Scientists believe Asteroids are remain of a planetary collision which happened many years ago.
Meteoroids
Small piece of rocks, moves around Sun just like Asteroids.
Sometimes Meteoroids come near Earth and in some cases enters atmosphere of the Earth.
In most cases they’ll burned up due to extreme friction but in rare cases they’ll reach surface and will form hollow on the surface.
Famous example being Meteoroid which was responsible for taking away 90% lives from Earth 65 million years ago.
Asteroids vs Meteoroids
(Asteroids)Smaller than planet but much bigger than Meteoroids
Galaxy
Huge system of billions of stars, and clouds of dust and gases.
There are millions of such galaxies with makes the Universe.
Our Solar System is part of Milky Way Galaxy. It appears like Milky white glowing path in a clear night.
It’s difficult imagining how big our Universe is.
