sentence: Scientists use lasers to slow atoms when cooling objects to very low temperatures.
sentences_before: In theory, 'absolute zero' is the temperature where the particles of matter stop moving. Absolute zero is impossible to achieve, because all particles move, even if it is just a small vibration. Even getting close to absolute zero is difficult because anything that touches an object being cooled near absolute zero would give heat to the objects.
concept_name: scientist
headings: Absolute zero
categories: Temperature Thermodynamics