Scientific American spoke with the astronomer who has contributed to the discovery of two thirds of Saturn’s known moons ...

The European Space Agency’s ACES mission could ultimately pave the way for a global network of atomic clocks that make these ...

One Pluto year equals 248 Earth years. At 1473 miles in diameter—about half the width of the United States—Pluto is the ...

Today, it’s believed that Jupiter and Saturn, the largest planets, were the first to fully form, both within a few million ...