GENERAL KNOWLEDGE

Detailed explanation-1: -A low or medium mass star (with mass less than about 8 times the mass of our Sun) will become a white dwarf. A typical white dwarf is about as massive as the Sun, yet only slightly bigger than the Earth. This makes white dwarfs one of the densest forms of matter, surpassed only by neutron stars and black holes.

Detailed explanation-2: -Low-and medium-mass stars burn cool and last for billions of years. These stars end when they gradually shed off their outermost layers. For stars much larger and hotter than our Sun, the ending will be a spectacular explosion called a supernova.

Detailed explanation-3: -A red giant is a dying star in the final stages of stellar evolution. In about five billion years, our own sun will turn into a red giant, expand and engulf the inner planets-possibly even Earth.

Detailed explanation-4: -NASA estimates that the sun will stay a white dwarf for around 10 billion years. However, other estimates suggest stars can stay in this phase for 1015, or a quadrillion, years. Either way, the time required to reach this stage is longer than the current age of the universe, so none of these exotic objects exist-yet.