There's still a lot to learn about the surface of Jupiter's moon
It could be the largest moon we’ve ever seen
A galactic near-miss.
It's completely different from Earth
Pebbles and planetesimals pummeled the planet's early surface
Buried under an ice cap, the water is so deep scientists couldn't probe to the bottom.
Two stars enter, one star leaves
Younger galaxies appear flatter than their more well-rounded elders
The closest potentially habitable planet has an intriguing interior
A spectacle previously thought impossible
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