Deep Space Astronomy

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Kelly Whitt, Kelly Whitt

Feature Writer Kelly Whitt

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Deep Space Astronomy

Pulsars and Neutron Stars

By: Shawn Landis

How these remnants of a dead star get formed. more...

Discovery of Astronomical X-Rays

By: Feature Writer 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: Feature Writer 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...

Black Hole or Neutron Star

By: Feature Writer 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: Feature Writer 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: Feature Writer Paul A. Heckert

A static isolated black hole has an event horizon or Schwarzschild radius surrounded by a photon sphere. more...

Black Hole Singularity

By: Feature Writer 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...

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