What Makes Space 'Cold?'

The video explains that heat is the speed of atom movement, while temperature is the average kinetic energy of these atoms. In space, a vacuum, temperature cannot be measured directly. When people refer to space as cold, they mean the cosmic microwave background radiation, a remnant of the Big Bang, with a temperature of 2.7 Kelvin. This radiation is evidence of the universe's origins. Although space is inhospitable, modern spacecraft are equipped with temperature control, ensuring astronauts' safety.

How do scientists define heat in relation to atoms?

What is the average kinetic energy of moving atoms referred to as?

What does the term 'cosmic microwave background radiation' refer to?

What is the temperature of the cosmic microwave background radiation in Kelvin?

How do modern spacecraft ensure the safety of astronauts regarding temperature in space?