This image from the Juno spacecraft shows the great red spot on Jupiter in beautiful detail. The Juno satellite was launched in 2011 and produced the image during a flyby on 11 July during which the satellite came as close as 3000 km to the cloud tops of Jupiter. The fast rotating storm on Jupiter is several times larger than the Earth and contains winds with speeds up to 600 km per hour. The feature is at least 150 years old, but observations of a large spot on Jupiter date back to the first astrophysical measurements from around 1600, although it is not clear if the storm observed at the time is the same that Juno captured now. The nature of the red colour is still not understood. One possibility is that it is due to chemicals that are formed as a result of cosmic-ray interactions with the ammonium hydrosulphide in Jupiter’s atmosphere.