The Fantastic Four are a team of superheroes who gained their powers after being exposed to cosmic radiation during a spaceflight. The team consists of Mr. Fantastic (Reed Richards), Invisible Woman (Susan Storm), Human Torch (Johnny Storm), and Thing (Ben Grimm).

Here's a more detailed explanation of how each member of the Fantastic Four got their powers:

1. Mr. Fantastic (Reed Richards): Reed Richards was the leader of the spaceflight and is known for his super-stretching abilities. After being exposed to cosmic radiation, his body gained the ability to stretch and contort in various ways, making him extremely flexible.

2. Invisible Woman (Susan Storm): Susan Storm, Reed Richards' girlfriend, gained the power to become invisible and create invisible force fields. She can also manipulate light waves to make herself and others invisible and can use her force fields for protection or offense.

3. Human Torch (Johnny Storm): Johnny Storm, Susan's younger brother, can control and generate fire. He can engulf himself in flames and fly, creating powerful blasts of fire and becoming immune to heat and combustion.

4. Thing (Ben Grimm): Ben Grimm, Reed's best friend and a former astronaut, transformed into the Thing after exposure to cosmic radiation. His body became incredibly strong and durable, resembling large orange rocks, giving him immense physical strength and invulnerability.

These extraordinary abilities allowed the Fantastic Four to become renowned superheroes, using their powers to protect the world from various threats and villains.