On June 7, 2021, NASA’s Juno spacecraft flew closer to Jupiter’s moon Ganymede than any spacecraft had ever before. Ganymede is the largest moon in the Solar System—a body larger than the planet Mercury. Its frozen surface holds interest as a distant water source. Analysts still ponder three unique features of Ganymede, one of which they’re now seeing for the first time.

In June 2021, researchers used radar images from the Magellan spacecraft to show that crustal blocks on the Venusian surface jostle against one another like blocks of pack ice on a lake.¹ This is just one of multiple lines of evidence that Venus is geologically active, and thus looks younger than expected.²
 

An interesting article¹ on physics.org caught my attention. Its title is “Solved: The Mystery of the Expansion of the Universe.” But this can be misleading.

Scientists led by Valerio Poggiali of Cornell University’s Center for Astrophysics and Planetary Science have used Cassini spacecraft data to learn a little more about Saturn’s largest moon Titan.

On December 21 about an hour before sunset, the planets Jupiter and Saturn will appear very close together low in the western sky in a celestial event called a conjunction.¹ In fact, the two planets will be so close together that they should appear as a “double planet” to the naked eye.