Science

Ganymede's core is composed of iron, which may be partially liquid and is surrounded by a thick mantle made of silicates.

The second Crew Dragon mission, SpaceX Crew-2, set the record for the longest spaceflight by the U.S. after spending 200 days in orbit.

The Moon always faces the Earth with the same side.

Ganymede was examined closely by the spacecraft Pioneer 10 and 11, Voyager 1 and 2, New Horizons, and Galileo.

The science that studies fungi is mycology. Mycologists have developed several classification systems for fungi.

Several of Titan’s mountains are named for mountains from J. R. R. Tolkien literature (i.e. Moria Montes), and colles (collection of hills) are named after Tolkien’s characters (i.e. Arwen).

Silver is also used in medicine. Its healing properties were already described by Hippocrates.

Tears are made up of three layers.

Fungi were considered a separate kingdom, more closely related to animals than to plants.

It is not yet known exactly which genes are responsible for the onset of mental anorexia nervosa.