What is the process by which a star converts hydrogen into helium, releasing energy in the form of light and heat?

Which law of thermodynamics defines temperature in terms of the concept of heat flow?

What is the name of the bright, reddish star located in the constellation Orion and known as the "hunter's shoulder"?

Which subatomic particle is responsible for carrying electric current in a metal conductor?

In optics, what is the term for the point at which parallel light rays either converge or appear to diverge after passing through a lens?

Which gas is responsible for the smell of rotten eggs?

What is the SI unit of work and energy?

What is the term for the process by which rocks change form or structure due to heat, pressure, or mineral composition changes?

What is the chemical formula for table salt?

Which of the following is a greenhouse gas that is more potent than carbon dioxide but less abundant?