Question

What is nebula . What is the nearest star to earth other than sun

Answer 1

Nebula :

a cloud of gas and dust in outer space, visible in the night sky either as an indistinct bright patch or as a dark silhouette against other luminous matter.

The nearest starting earth other than sun is Alpha Centauri A

Answer 2

A star is an astronomical object consisting of a luminous spheroid of plasma held together by its own gravity. The nearest star to Earth is the Sun.