by APOD Robot » Sun Aug 05, 2018 4:05 am
Trapezium: At the Heart of Orion
Explanation: Near the center of
this sharp cosmic portrait, at the heart of
the Orion Nebula, are four hot, massive stars
known as the Trapezium. Gathered within a region about 1.5 light-years in radius, they dominate the core of the dense Orion Nebula Star Cluster.
Ultraviolet ionizing radiation from the
Trapezium stars, mostly from the brightest star
Theta-1 Orionis C powers the complex star forming region's entire visible glow. About three million years old, the Orion Nebula Cluster was even more compact in its younger years and a
recent dynamical study indicates that
runaway stellar collisions at an earlier age may have formed a black hole with more than 100 times the mass of
the Sun. The presence of a
black hole within the cluster could explain the observed high velocities of the
Trapezium stars. The Orion Nebula's distance of some 1,500
light-years would make it the
closest known black hole to planet Earth.
[url=https://apod.nasa.gov/apod/ap180805.html] [img]https://apod.nasa.gov/apod/calendar/S_180805.jpg[/img] [size=150]Trapezium: At the Heart of Orion[/size][/url]
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