NASA has discovered evidence that four of Uranus' largest moons may contain water.
Scientists found evidence of hydrogen and oxygen, the key components of water, in the plumes of gas released from the moons.
The possibility of liquid water on the moons is significant because water is one of the main ingredients required for life.
The four moons in question are Ariel, Umbriel, Titania, and Oberon. All of these moons are large enough to hold subsurface oceans.
The discovery was made as part of a broader effort to explore the outer solar system.
The next step for scientists is to use the James Webb Space Telescope, set to launch in 2021, to study the moons in more detail.
The discovery of water on Uranus' moons is an exciting development that could provide new insights into the search for life beyond Earth.