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Energy

Relativity

Gravity is the force we are most familiar with in everyday life. It has been studied for longer than the other forces of nature. However, it is also the least well understood.

An image showing many galaxies within a cluster. Towards the centre, the light has curved, appearing to form the outline of a face and a mouth smiling whilst two bright galaxies look like the eyes.
This work by NASA/ESA is licensed under Creative Commons Zero v1.0 Universal
A galaxy cluster appearing to have two eyes and a nose to form a smiley face. The eyes are actually very bright galaxies, and the lines are arcs caused by an effect called gravitational lensing.

Rockets Quiz

Rockets are used to send astronauts, spacecraft, or equipment to space. They are a vital part of space exploration and research. But how much do you know about how rockets work?