Answer:The given statement is true.
Step-by-step explanation:
Nebulas are the interstellar clouds composed of dust, hydrogen gas, helium gas and other ionized gases.They are cold clouds in which star is born.
These atoms of gases come closer to each other due to gravity and form a clump.
In clumps, these atoms of gases get compressed under the action high pressure by which nuclei of these atoms undergoes fusion reaction.The energy released due to this fusion reaction is in the form of heat and light.