* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download Another exAmple: expository mode
Corona Australis wikipedia , lookup
Star of Bethlehem wikipedia , lookup
Orion (constellation) wikipedia , lookup
Canis Minor wikipedia , lookup
Corona Borealis wikipedia , lookup
Cassiopeia (constellation) wikipedia , lookup
Cygnus (constellation) wikipedia , lookup
Planetary habitability wikipedia , lookup
Aquarius (constellation) wikipedia , lookup
Canis Major wikipedia , lookup
Future of an expanding universe wikipedia , lookup
Stellar classification wikipedia , lookup
Perseus (constellation) wikipedia , lookup
Stellar kinematics wikipedia , lookup
H II region wikipedia , lookup
Astronomical spectroscopy wikipedia , lookup
Type II supernova wikipedia , lookup
Timeline of astronomy wikipedia , lookup
Corvus (constellation) wikipedia , lookup
Another Example: Expository Mode stars. Young stars convert hydrogen to helium through a process known as nuclear fusion to produce light. As stars use up this hydrogen, in a process that takes billions of years, they pass through certain phases or stages. In each stage, the star’s brightness, temperature, and size change. The redgiant phase occurs when the star begins to run out of hydrogen. Its center then contracts, and the temperature and pressure at the center increase. However, the star’s outer layers cool and expand, increasing the star’s overall size. Red giants Betelgeuse, in the constellation Orion, is a can be anywhere from 10 well-known red-orange giant. to 100 times the size of the sun. Most are red, though some may be orange or yellow. Depending on its overall mass, a red giant may go on to become a white dwarf or a supergiant. © The Hampton-Brown Company, Inc. A. Dupree (CfA), R. Gilland (STScl), FOC, HST, NASA Red Giants The red-giant phase is a stage in the “life cycle” of