The concept of Planet X, or Planet Nine, has captivated astronomers for decades. This hypothetical planet, theorized to be ...

Astronomers are now confident the Event Horizon Telescope can help them decode elusive origins of black hole jets.

Galileo Galilei's telescopic discovery of Jupiter's four moons in 1610 revolutionized astronomy and supported heliocentric ...

Astronomy can often give us clues to the past that are otherwise lost to history. In one case, an Italian astronomer has ...