Stars
The brightness of a star on an HR diagram.
What is luminosity?
What is a supergiant?
This is most likely spot for planetary nebulas to form in a spiral galaxy.
What are spiral arms?
This forms after the death of Sun-mass stars.
What are white dwarfs?
This is the outermost layer of the Sun.
What is the corona?
This graphs stars according their brightness and temperature.
What is a HR diagram?
This is the form of electromagnetic radiation released by black holes.
What are x-rays?
This type of galaxies forms without obvious structure.
What are elliptical galaxies?
This is the form a dead star that releases radio waves rapidly.
What is a pulsar?
This is the most common element in the Sun.
What is hydrogen?
This is the most important factor for how long a star will live?
What is the mass of star?
These are objects that keep spiral galaxies together.
What is supermassive black holes?
This composes most of the mass in our galaxy.
What is dark matter?
This is what is released by the death of a Sun-like star.
What is a planetary nebula?
This is the age of the Sun right now.
What is 5 billion years?
This process balances the star's collapse and outward push.
What is gravitational equilibrium?
This is the area around the black hole where matter collects.
What is the accretion disk?
This is how far our Sun is from the core of the Milky Way
What is 30,000 lightyears?
This is the type of star that overcomes the repelling force of electrons and protons.
What is a neutron star?
The last element that a star like our Sun could fuse before going nova.
What is iron?
This is a group of stars that have low surface temperatures and very high luminosities.
What are red supergiants?
This is what bends steeply downward as you near a black hole.
What is spacetime?
This is the age of the oldest galaxies we have ever observed.
What is 13 billion years old?
This is repeating explosion as binary stars revolve and one steals matter from the other.
What is a white-dwarf supernova?
This is the age that our Sun will be when it goes nova.
What is 10 billion years?