Astronomers have uncovered increasing evidence that some bodies in our solar system, like Jupiter's moon Europa and Saturn's moon Enceladus, are actually ocean worlds.
The discovery of 20 previously unknown moons around Saturn has helped the ring planet surpass all others in our solar system, according to the International Astronomical Union's Minor Planet Center. It now has 82 known moons; Jupiter has 79.
When Saturn was approaching closest to Earth this year on June 20, the Hubble Space Telescope captured the view.
Thirty years ago, NASA's Voyager 2 mission flew by Neptune, capturing the first close-up images of the blue gas giant. Before this, the eighth planet in our solar system was only known as a fuzzy dot in the distance.
Earth seems like the perfect hub for life because it's the only planet known so far to host it -- but new research suggests that other planets could have oceans that are even more hospitable, offering life that is more varied than we know it.
The night skies in August are full of celestial wonders, including bright planets and a meteor shower.
The rings of Saturn are shining bright this month.
NASA announced the latest mission in its New Frontiers program, called Dragonfly, which will explore Saturn's largest moon, Titan. It's the only moon in our solar system that has an atmosphere.
During the final year of NASA's Cassini mission before it completed a "death dive" into Saturn's atmosphere in 2017, the spacecraft gathered as much data as possible about the planet's rings.
While Saturn's rings may disappear in less than 100 million years because gravity is pulling them into the planet, apparently they haven't always surrounded the planet, either. The finding was published in the journal Science on Thursday.
Saturn's rings make it one of the most striking planets in the solar system, but scientists believe they could disappear in less than a 100 million years -- which isn't all that long when you consider that the gas giant itself is more than 4 billion years old.
A year after Cassini ended its 20-year mission to study Saturn, the last data the spacecraft recorded before plunging into the planet's atmosphere are revealing its long-held secrets.
Last year, astronomers announced that ocean worlds like Europa and Enceladus may be the best chance for finding life outside of Earth in our solar system. Now, the discovery of complex organic molecules in plumes that rise from Enceladus' subsurface ocean further suggests that the moon could support life as we know it.
Nearly three years after NASA's New Horizons spacecraft flew past Pluto, we're still learning about the dwarf planet.
Learn more about our space program and the cosmos with this quiz!