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star or nebula
No it is a small star (about the size of Earth) that is VERY dense and quite hot (although it is not producing new energy).
Larger object.
Planet.
Hydrogen and Helium
star or nebula
star
star
Amount of energy produced is very large. This energy can be utilised.
A greater surface area allows for greater energy transfer.
carbon dioxide, water and large amounts of energy
Yes.
A large radioactive atom breaks into smaller atoms, producing nuclear energy.
A star
A star
You don't say what speed the small object has. If both have the same speed then the heavier one will have more kinetic energy.
molecular cloud