Hubble Space Telescope image of UGC 12158, a “Grand Design” barred spiral (Sb D) galaxy, 384 million light years distant in the constellation Pegasus. With a distinct bar in its nuclear region and 140,000 light years in diameter, it is believed to be similar in size and structure to our home galaxy, the Milky Way.[…]
Ever since it was discovered that the rotational dynamics of spiral galaxies were inconsistent with the observed mass of those galaxies, it has been postulated that missing mass or dark matter was responsible. With fellow staff-member Kent Ford, astronomer Vera Rubin announced at a 1975 meeting of the American Astronomical Society the discovery that most stars in spiral galaxies orbit at roughly[…]
This video is the first in a short series on this topic. Many studies of late have been published regarding this enigmatic phenomenon known as “Dark Matter“. The term is a misnomer since the expression suggests that there is some “matter”, some quantifiable, measurable quantity, heretofore unobserved. This is not the case; the term was[…]
