Which statement is true about stars is correct?
f-star formation begins in a nebula
g- white dwarfs become main-sequence stars when they gain mass
h- supergiants are stars that can absorb black holes
j- main sequence stars are formed by comets

Idon’t quite understand this problem

Contains chemical energy. a. heat b. light c. natural gas

1which body contains the majority of the mass in the solar system earth jupiter the moon the sun 2 what keeps the objects in the solar system such as planets orbiting around the sun the force of gravity the galaxy exerts on all objects within it including the solar system the great distance between the sun and the planets the sun's nuclear fusion which acts on each object the gravitational force between the sun and each object in the solar system