These phenomenon are called solar flares. They are caused by the powerful magnetic fields of the sun interacting and causing an outburst of solar material. Further information, real-time animations and images of solar flares can be seen at NASA's Solar and Heliospheric Observatory site in the related links below.
Solar Flare
The surface temperature of the star Thuban is 9800 K. Another name for the Thuban star is Alpha Draconis. It is thought to be located 310 light years from the constellation of Draco.
No, a nova is a star showing a sudden large increase in brightness and then slowly returning to its original state over a few months. Novae are caused by a cataclysmic nuclear explosion on a white dwarf, which causes a sudden brightening of the star and they can repeat on the same star as material repeatedly builds up on its surface from a nearby companion. They are therefore always in a binary system. Novas/Novea should not be confused with "Supernovae" which are different and are classified into different types.
Surface Temperature: 4000 K
About 7900 degrees Celsius, surface temperature.
Solar Flare
The sudden eruption from the surface of a star is called a plasma ejection. It is also known as a coronal mass ejection. They can be very dangerous if they happen to eject toward a planet nearby.
Nova
A nova
the surface is wierd
super nova
super nova
super nova
One of the most hottest star is Eta carinae. its surface temperature is 36000-40000 Kelvin. it color is blue.
The surface temperature of the star Thuban is 9800 K. Another name for the Thuban star is Alpha Draconis. It is thought to be located 310 light years from the constellation of Draco.
the surface of the star.
Rigel is a star and stars do not have a surface, as such. The nearest description of what would be its surface would be a mass of very hot plasma.