The planets Jupiter and Neptune experience a triple conjunction as seen from Earth.
Scientists from the University of Geneva announce that a previously-known Neptune-sized exoplanet, HAT-P-11b, has a slowly-escaping helium atmosphere.
New research suggests Europa, a moon of Jupiter, may be covered in tall, jagged ice spikes, presenting a problem for any potential landing on its surface.
JunoCam captures an image of Jupiter's "brown barge", a cyclone-like shape that has weather patterns in Jupiter's atmosphere.
The European Southern Observatory's Very Large Telescope captures an image of PDS 70b, making it the first clear image of a planet forming from the disk of gas and debris surrounding its host star.
Ten new moons are discovered around Jupiter, raising the count to 79 confirmed moons. One of these new moons, S-2016 J 2, nicknamed "Valetudo", is notable for orbiting backwards compared to the other moons in its vicinity, and may collide with one of them in the future.