### person | dwarf:

Red dwarfs
* are of low luminosity but common
  - real misers at burning hydrogen
* are the most common of all stars
  - stars in the galaxy
  - usually far too faint to be seen with the naked eye, that means without a telescope
* burn their fuel slowly , so they shine with less light than hot stars.
* can live trillions of years , much longer than brighter stars.
* do everything at a slower rate.
* live longer than any other type of star.
+ Proxima Centauri, Characteristics: Stars
  * Red dwarfs are usually far too faint to be seen with the naked eye, that means without a telescope. It has an apparent magnitude of 11 while its absolute magnitude is a very dim 15.5. Even from Alpha Centauri A or B, Proxima would only be seen as a 5th magnitude star.
+ Red dwarf, Life and death: Types of stars
  * Red dwarfs can live trillions of years, much longer than brighter stars. A red dwarf dies when it burns all of its fuel. To start with, the fuel is the chemical element hydrogen. At present, no red dwarf star is known which has gone beyond this stage.
+ Star, Birth and life and death of stars: Astrophysics
  * Red dwarfs live longer than any other type of star. At the end of their lives, they become dimmer and dimmer. Red dwarfs do not explode.
  * A 'red dwarf' is a kind of star. Red dwarf stars are smaller than half the size of the Sun. They are also cooler than most stars. Red dwarfs burn their fuel slowly, so they shine with less light than hot stars.

### person | dwarf:

White dwarfs
* Most white dwarfs have mass
  - radii
* Most white dwarfs remain dwarfs
* Some white dwarfs are part of a binary star sytem
  - so cool they actually turn blue, giving off a unique luminosity
  - become black dwarfs
  - go through phases
  - have almost pure hydrogen or helium atmospheres, the lightest of elements
  - make bubbles
* are about the size of the Earth and appear very faint
  - alot like hot embers
  - also sometimes pulsationally unstable
  - among the tiniest and dimmest stars in our Milky Way galaxy
  - compact objects supported by degeneracy pressure
  - degenerate matter in a solid state
  - different
* are extremely dense, with electrons packed very closely together in their core
  - initially extremely hot
  - intrinsically very faint and are thus hard to detect
  - made up of waste products of the nuclear fusions
  - objects of great interest
  - one of the extremely dense remnants of normal stars like the sun
* are the commonest stars in the Galaxy
  - earth-sized remains of ordinary stars like the sun
  - likely progenitor of type Ia supernova
  - most common kind of star in the Galaxy
  - smallest and least bright of all the stars
  - therefore exceptionally dense bodies
  - usually around the same size as our earth
* are very compact, usually the size of the Earth, but with a mass comparable to the Sun
  - heavy, very compact and very hot
* are very hot at first and cool over a long period of time
  - but dim due to their small surface area
  - small, typically about the size of the Earth
  - very, very dense
* are white dwarfs because electron degeneracy holds up the star against gravity
  - they have no hydrogen to burn
* burn no nuclear fuel and shine by residual heat.
* contain approximately the mass of the sun but have roughly the radius of Earth.
* do exist.
* have relatively low rotational velocities.
* lack the mass for further gravitational compression to take place.
* occur when a star runs out of energy and shuts down.
* shine with a white hot light but once all of their energy is gone, they die
* start out very hot.