What Color Is A White Dwarf? The visible radiation emitted by white dwarfs varies over a wide color range, from the blue-white color of an O-type main sequence star to the red of an M-type red dwarf. White dwarf effective surface temperatures extend from over 150,000 K to barely under 4,000 K. Why is a
What Evidence Suggested That Herschel Discovered A Planet? He discovered the planet Uranus, hypothesized that nebulae are composed of stars, and developed a theory of stellar evolution. He was knighted in 1816. What planetary discovery does William Herschel make who helped him make this discovery? William Herschel KH FRS Known for Discovery of Uranus Discovery
What If We Lived In A Globular Cluster? To live on an Earth in a globular cluster would mean that the cluster’s stars (if they were like our Sun) would combine to create a night sky at around 20 times brighter than Earth’s night sky at full Moon. Could there be life in a globular
What Is The Last Element To Fuse In A Low Mass Star? Over its lifetime, a low mass star consumes its core hydrogen and converts it into helium. The core shrinks and heats up gradually and the star gradually becomes more luminous. Eventually nuclear fusion exhausts all the hydrogen in the star’s core. What elements
What Is The Evolution Of A Low Mass Star? For low-mass stars (left hand side), after the helium has fused into carbon, the core collapses again. As the core collapses, the outer layers of the star are expelled. A planetary nebula What is the evolution of a star? Stellar evolution is the process by which
What Is The Stellar Process In Which The Fusion Of Hydrogen Produces Other Elements? Stellar nucleosynthesis is the creation (nucleosynthesis) of chemical elements by nuclear fusion reactions within stars. Stellar nucleosynthesis has occurred since the original creation of hydrogen, helium and lithium during the Big Bang. What elements does stellar fusion produce? Stars create new
What Is The Life Cycle Of A Star In Order? Stars come in a variety of masses and the mass determines how radiantly the star will shine and how it dies. Massive stars transform into supernovae, neutron stars and black holes while average stars like the sun, end life as a white dwarf surrounded by
Which Stage Is Stellar Evolution Is The Longest? Because the middle age of a star is the longest period in stellar evolution, one would expect most of the observed stars to be at this stage and to show a strong correlation of luminosity with color (color is a measure of stellar temperature). Which stage of
How Do We Determine Ages Of Solar System Bodies? How old are the objects within our Solar System? One method scientists use to answer this important question is counting the number of craters on their surface. This information, combined with the time it takes for craters to form on each body, gives us a strong
How Can We Study The Life Cycle Of Stars? An important tool in the study of stellar evolution is the Hertzsprung-Russell diagram (HR diagram), which plots the absolute magnitudes of stars against their spectral type (or alternatively, stellar luminosity versus effective temperature). Can the life cycle of a star be studied directly? Basically, it is