The hottest thing on Earth is the plasma created in a laboratory setting. Scientists have achieved temperatures exceeding 100 million degrees Celsius (180 million degrees Fahrenheit) in experiments involving nuclear fusion. These extreme temperatures are necessary to replicate the conditions found in the core of stars, where nuclear fusion occurs naturally.
In these experiments, hydrogen isotopes are heated to such high temperatures that they form a plasma, a state of matter where electrons are stripped from atoms, creating a highly energized gas. The goal of these experiments is to harness the energy produced by nuclear fusion, which could provide a nearly limitless and clean energy source.
While the core of the Earth is also extremely hot, reaching temperatures of about 5,700 degrees Celsius (10,300 degrees Fahrenheit), it pales in comparison to the temperatures achieved in these laboratory experiments. The Sun’s core, where nuclear fusion naturally occurs, reaches temperatures of about 15 million degrees Celsius (27 million degrees Fahrenheit), still less than the temperatures achieved in some fusion experiments.
In summary, the hottest thing on Earth is the plasma created in nuclear fusion experiments, which can reach temperatures over 100 million degrees Celsius.