Deep Space Astronomy
All contributors in Deep Space Astronomy
What happens when galaxies collide? The result is often galactic-sized fireworks and strange and beautiful new shapes. more...
A tremendous blank spot free of galaxies, stars, dark matter or black holes has been discovered in the distant reaches of space. more...
Google is now doing for the rest of the universe what they already did for Earth, by allowing computer users to view the universe around them. more...
Astronomers have found new galaxies that are the most distant known in the Universe. more...
Neutron Star Has Monster X-Ray Jet
NASA's Chandra X-ray Observatory reveals a neutron star powering a gigantic jet that rivals black holes and their jets. more...
A NASA satellite has spied two supernova bursting in one galaxy in less than a month. more...
Evidence for Dark Matter Found
A collision of galaxy clusters has produced a ring of dark matter that was detected by NASA and ESA's Hubble Space Telescope. more...
All feature articles in Deep Space Astronomy
By: Shawn Landis
How these remnants of a dead star get formed. more...
Discovery of Astronomical X-Rays
By:
Paul A. Heckert
The discovery, in the early 1960s, of the first celestial X-ray sources led to the first star identified as a likely black hole candidate, Cygnus X-1. more...
X-Ray Flickering in Cygnus X-1
By:
Paul A. Heckert
Identifying the star HDE226868 as the optical counterpart to the astronomical X-ray source, Cygnus X-1, was the first step in identifying it as a black hole. more...
By:
Paul A. Heckert
Measuring the mass of the unseen companion in a binary X-ray source, such as Cygnus X-1, tells us if it is a black hole or a neutron star. more...
Origin of the Idea of Black Holes
By:
Paul A. Heckert
Michell first suggested the idea of black holes in 1783. Schwarzschild's exact solution to Einstein's general relativity equation led to the prediction of black holes. more...
Event Horizon and Photon Sphere
By:
Paul A. Heckert
A static isolated black hole has an event horizon or Schwarzschild radius surrounded by a photon sphere. more...
By:
Paul A. Heckert
Inside the event horizon or Schwarzschild radius of a static isolated black hole the mass of the collapsed star is compressed into a singularity point. more...
All contributing articles in Deep Space Astronomy