2. How is it that we know what we know about stars?
Stars surface temperature are found by the color of the star.
Red- 3,200°c
Yellow- 5,500°c
Blue/white 20,000°c
Most stars are made up of 73% hydrogen 25% helium and 2% of other elements. However you can find a more accurate percentage of elements and mass in a star using a spectrograph.
Apparent brightness is as seen on earth and can easily be measured by various “electronic devices.”
Absolute brightness is much harder to find as the astronomer needs to find the apparent brightness and the distance of the star to the earth.
Astronomers can't find an exact life of a star but can be estimated by the speed of rotation of the star. The slower the star spins the older it is. It is like a top,…show more content… This happens when the star runs out of fuel and collapses on its self and creates essentially a magnetic star.
Nova- A nova is a star that gets enormously bright quickly and returns to its original states in around two months. These stars are originally dim because they have slowed down on the nuclear fusion process because they ran out of gas. These stars get rapidly bright because they essentially “steal” fuel from a nearby star in the same orbit. When two stars pair up its called “binary.”
Quasar - Quasars are very mysterious bright celestial objects thought to be in a stage of evolution of a galaxy. Quasars also are thought to have a blackhole near the middle of them. Quasars are so bright because they emit a lot of energy.
Pulsar - A pulsar is a rapidly rotating star that emits radio waves and other various electronic waves. A pulsar looks like it flickers from the view on earth but is actually just rotating beams of light in two directions, much like a lighthouse. Pulsars are classified as neutron stars because they aren't a living star. There are fast pulsars and slow pulsars. The slowest pulsars spin one time a second and faster one can spin hundreds of time in a…show more content… This has been a question for a long time, why cant Pluto be a planet, how big does a planet have to be, these are all questions people ask. In return, scientists decided to really define what a planet was in 2006. In order for something to be a planet, it must orbit the sun, have the sufficient mass to be somewhat rounded, not a moon of another planet and has pushed mall debris out of its orbit. The difference between a dwarf planet and a regular planet is that a dwarf hasn't pushed small debris out of its orbit meaning its mass isn't great enough to do such a thing, this is why Pluto isn't a
