NASA’s Juno spacecraft recently caught this ominous view of Jupiter, which shows a massive black spot atop the gas giant’s churning clouds. Looks scary, but there’s a perfectly reasonable explanation: It’s a shadow cast by Jupiter’s extremely volcanic moon, Io. Juno captured this stunning series of images on September 12 while participating in its 22nd perijove, or close encounter, with Jupiter. The NASA spacecraft, which arrived at the Jovian system in July 2017, is in a highly elliptical polar orbit that brings it close to the gas giant’s cloud tops and then out again into deeper space. Juno was around 8000km from the surface when its JunoCam snapped these images, and the probe is now on a trajectory that will take it over eight million km away from the gas giant before swinging back again for its 23rd perijove, according to Universe Today. Juno is currently scheduled to perform around a dozen more perijoves before the mission ends in July 2021, but the mission could be extended further into the 2020s This is about as close to a total solar eclipse as we’ll ever get to see on Jupiter, the largest planet in the Solar System. To be fair, it’s more of an annular eclipse because Io’s shadow is not even close to covering Jupiter’s entire surface. To be even fairer, we probably shouldn’t be referring to this celestial event as an eclipse at all it’s more of a transit, similar to the way exoplanets travel across their host stars, allowing astronomers to detect them from our vantage point on Earth. Still, the shadow is quite large, all things considered; Io is only slightly larger than Earth’s Moon. The large black circle is due to an optical effect in which the total size of an object’s shadow, the penumbra, increases with distance from the light source, in this case, the Sun. A similar thing happens on Earth during solar eclipses — an effect that was beautifully captured from space in 2016.