http://www.ck12.orgCHAPTER
(^24) Astrophysics
Chapter Outline
24.1 The History of Astronomy
24.2 THELIFECYCLE OF ASTAR
24.3 THEHERTZSPRUNG-RUSSELLDIAGRAM
24.4 REFERENCES
One of the most recognized constellations is Orion, with its three prominent belt stars and four stars in the trapezium.
This constellation can be seen at night ascending in the east, visible from all parts of the globe. In November of 2012,
an international team of astrophysicists announced the result of their work in computer modeling, which suggests
that a famous nebula –or cloud –in Orion known as the Orion Nebula has a black hole at its heart, whose mass is
some 200 times the mass of our sun.