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The entire wiki reimagined as a visual magazine with video discovery · Watch your interests come alive
WikiVisually
The entire wiki reimagined as a visual magazine with video discovery · Watch your interests come alive
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Variable star
Videos
A variable star is a star whose brightness as seen from Earth changes systematically with time. This variation may be caused by a change in emitted light or by something partly blocking the light, so
Comparison of VLT-SPHERE images of Betelgeuse taken in January 2019 and December 2019, showing the changes in brightness and shape. Betelgeuse is an i
Comparison of VLT-SPHERE images of Betelgeuse taken in January 2019 and December 2019, showing the changes in brightness and shape. Betelgeuse is an intrinsically variable star.
A photogenic variable star, Eta Carinae, embedded in the Carina Nebula
A photogenic variable star, Eta Carinae, embedded in the Carina Nebula
Herbig Ae/Be star V1025 Tauri and surrounding molecular nebula
Herbig Ae/Be star V1025 Tauri and surrounding molecular nebula
Artist's impression of a large dust cloud in the envelope of R CrB
Artist's impression of a large dust cloud in the envelope of R CrB
Cygnus X-1
Videos
Cygnus X-1 is a galactic X-ray source in the constellation Cygnus and was the first such source widely accepted to be a black hole. It was discovered in 1964 during a rocket flight and is one of the s
Variable star
…is an accreting compact object: either a white dwarf, neutron star, or stellar mass black hole. A notable example of such a variable X-ray source is Cygnus X-1. DQ Herculis systems are interacting binaries in which a low-mass star transfers mass to a highly magnetic white dwarf. The white dwarf spin period is…
The companion star of the black hole Cygnus X-1 is the brighter of the two stars in the middle of the photo. A bowshock is created by the jet of energ
The companion star of the black hole Cygnus X-1 is the brighter of the two stars in the middle of the photo. A bowshock is created by the jet of energetic particles from the black hole as they collide with the interstellar medium. It can be seen as the arc near top of the photo.
X-ray image of Cygnus X-1 taken by a balloon-borne telescope, the High-Energy Replicated Optics (HERO) project
X-ray image of Cygnus X-1 taken by a balloon-borne telescope, the High-Energy Replicated Optics (HERO) project
Chandra X-ray Observatory image of Cygnus X-1
Chandra X-ray Observatory image of Cygnus X-1
A Chandra X-ray spectrum of Cygnus X-1 showing a characteristic peak near 6.4 keV due to ionized iron in the accretion disk, but the peak is gravitati
A Chandra X-ray spectrum of Cygnus X-1 showing a characteristic peak near 6.4 keV due to ionized iron in the accretion disk, but the peak is gravitationally red-shifted, broadened by the Doppler effect, and skewed toward lower energies