PhysLink.com Logo

Question

Does the sun move at all?
Asked by: Booger

Answer

Relative to what?
Motion of any object is only valid when compared to something else.

The Sun orbits the center of the Milky Way Galaxy at about 225 Km/sec, and our Galaxy itself has a motion in its Local Group of galaxies of about 100 Km/sec. Our Local Group, in turn, has a speed of about 220 Km/sec relative to the Super Cluster it resides in, and there are further layers of motion beyond that.

Milky Way
The Milky Way - Our Galaxy

Perhaps the best measure of the Sun's overall 'motion' is based on the observed Doppler Shift of the Cosmic Background Radiation (COBE). That measure indicates a motion of about 390 Km/sec for our Sun vs. the Universe as a whole.
Answered by: Paul Walorski, B.A., Part-time Physics Instructor


Science Quote

'I beseech you to take interest in these sacred domains so expressively called laboratories. Ask that there be more and that they be adorned for these are the temples of the future, wealth and well-being. It is here that humanity will grow, strengthen and improve. Here, humanity will learn to read progress and individual harmony in the works of nature, while humanity's own works are all too often those of barbarism, fanaticism and destruction.'

Louis Pasteur
(1822-1895)


All rights reserved. © Copyright '1995-'2017 PhysLink.com