Tag: our solar system

Every planet in solar system except venus and uranus rotates frm west to east so uranus rotates from east to west.

A unique feature of Uranus is that it appears to roll along its orbital plane. This is because it has a highly tilted axis which makes it almost parallel to its orbital motion and the planet appears to roll.

Jupiter is the fastest rotating planet. It take only 9 hours and 55 min to complete one rotation about its own axis.

From summer solstice (June 21), the Sun starts moving towards the South and from winter solstice (December 22), the Sun starts moving towards North. So during summer solstice, it is in the south eastern part and in winter solstice it is in the north eastern part. However, there are 2 days, i.e., March 21 and September 23, when the Sun rises exactly in the East.

With the development of the heliocentric model by Nicolaus Copernicus in the 16th century, the sun was believed to be the center of the Universe, with the planets (including Earth) and stars orbiting it. 

Every planet is at a different distance from the Sun and has a fixed orbit in which it revolves around the Sun. The Sun"s gravitational force holds the planets in this place and they do not collide with each other as their orbits are non-intersecting.

As the distance between the Sun and the planet increases, the time taken by the planet to complete one revolution around the Sun also increases as the planet has to cover more distance as compared to the planets before it.

Just like moon, Venus too rotates from East to West. Thus, only that part of Venus is visible to us which reflects the light from the Sun towards us. Hence, the Venus appears to show phases because the Earth and Venus rotate in opposite direction.

This is the definition of Chandrasekhar's Limit . 
Degenerate electron pressure will not be sufficient to prevent core collapse of white dwarf if its mass becomes 1.4 times or more of our solar mass.

Planets are solid heavenly bodies which revolve around the Sun in closed elliptical paths. A planet is made of rock and metal and produces no light of its own. A planet shines because it reflects the light of the Sun. Since, the planets are much nearer to the stars, they appear to be big and do not twinkle at night. The planets move around the Sun from West to East, so the relative positions of the planets keep changing day by day. They are very small compared to the sun and other stars. 
Hence, the star appears to remain in a fixed position with respect to each other whereas the distance between the planets keep changing constantly.