Do planets actually revolve around the sun? Maybe they follow the sun around a more central Star in middle of Galaxy? Based on the heliocentric model of orbiting, how could the planets revolve around the sun this way, if this it were true?

If $theta$ is in radian measure, a circular arc, subtending an $angle theta$ at its center, is of length $(radius)Xtheta$ This is an approximation to its chord length $...

As with anything orbiting around body, the smaller the orbit the faster the object travels. Particles in an accretion disc around a large star will be travelling relatively slowly Particles...

When we observe the position of a star its position changes over the course of a year. It will return to the same position a year after the first measurement....

It is a scientific estimate that revolves about about Milky Way center with period about a quarter of a billion years. Sun;s distance from the center is about 63...

the estimated mass of the black hole is 4.6 million solar mass.

The center of mass of the Earth and Moon is called the Earth-Moon Barycenter or EMB. It is about 1,700km beneath the Earth's surface. Both the Earth and the Moon...

Planets are the heavenly bodies revolving around the sun. These revolve around the sun just because of the gravitational force which is exerted on the planets by the sun. If...

Wobbling, transit methods can only find large planets,..Directs observation is also difficult..When planet isvfar away the periods are very long and difficult to watch with the present day technology..

The solar system is almost all in a plane because it was formed from a relatively flat disk of material. The solar system is however nor 2 dimensional. All of...

The relationship between a star's distance and its parallax angle is given by $d = 1/p$, where the distance $d$ is measured in parsecs (equal to $3.26$ light years) and...