The Hubble Space Telescope uses solar energy. It has two large solar arrays that are constantly pointed towards the Sun, collecting solar radiation and converting it into electricity.

Here's a bit more detail:

* Solar arrays: These are large, flat panels covered in solar cells that capture sunlight.

* Battery packs: Hubble also has nickel-hydrogen batteries that store the energy collected by the solar arrays. These batteries are used when Hubble is in the Earth's shadow and cannot receive direct sunlight.

* Power distribution system: The collected solar energy is distributed throughout the telescope to power its instruments, computers, and other systems.

This system allows Hubble to operate continuously, even when it is in Earth's shadow.