Solar System Flashcards
What is the shape of the earth?
Geoid
What are the planets that revolve anti clockwise?
All planets revolve anti clockwise.
Which are the planets that rotate clockwise?
Venus and Uranus
What is the density of the earth?
5.52 g/cm3
Europa, Callisto, IO, Ganymede are the moons of?
Jupiter.
Titan, Tethys, Phobe, Atlas, Pandera are the moons of?
Saturn.
Which is the largest known asteroid?
Ceres. It is located in the asteroid belt between Mars and Jupiter.
Which is the hottest and the brightest planet?
Venus. It is closest to earth and is also known as earth’s twin.
Which planets are known as the inner planets?
Mercury, Venus, Earth and Mars are known as the inner planets.
What are gas giants?
Planets after the asteroid belt i.e. Jupiter, Saturn, Uranus and Neptune are known as Gas giants.
In what kind of orbit do planets revolve around the Sun?
Elliptical
Name some dwarf planets in our Solar system.
Ceres the asteroid in the asteroid belt.
Pluto, Eris, Haumea, Makemake in the kupier belt, i.e. region after Neptune.
What is the mass relation between the composites of Solar system?
Sun accounts for 99.86% of the Solar system’s known mass. The four gas giants accounts for 99% of the remaining mass.
What is aphelion and perihelion?
Aphelion is the farthest position of planet wrt to the Sun.
Perihelion is the closet.
When is aphelion and perihelion for earth?
Aphelion : 4 July
Perihelion: 3 Jan
What is the distance between one degree of latitude?
It is 69 miles or 111 kms. The distance between 1 degree of longitude along the equator is also 69 miles or 111 kms.
What do you know about the Pole star?
It is positioned vertically above the North pole.
It can be viewed only from the northern hemisphere.
It makes the exact angle as that of the latitude, i.e. from poles, it is visible at 90 degrees and from equator it is visible at 0 degrees (at the horizon)
Earth is tilted in its axis by what angle?
Its is tilted by 23 degree 30 minutes. It is for the same reason that the tropical belt lies between 0 to 23d 30m in both the hemisphere and the Arctic and Antarctic circle is at (90-23.5) 63d 30m latitude at both the hemisphere.
Why is International Date Line (IDL) not a straight longitude?
Had it been straight, it would have probably divided the country through which it passed into two extreme time zones, i.e 24 hours apart.
