PRAGUE, Czech Republic — The universe really is expanding — astronomers are proposing to rewrite the textbooks to say that our solar system has 12 planets rather than the nine memorized by generations ...

Fantasizing about interplanetary exploration is a fun mental exercise, but the harsh realities of life (or lack thereof) in ...

Astronomers have discovered icy rocks in the outer solar system that seem to defy the laws of physics, suggesting the ...

SPHERE’s detailed images of dusty rings around young stars offer a rare glimpse into the hidden machinery of planet formation ...

When I was a kid, there were nine planets. Now we know of thousands! But that includes exoplanets, alien worlds that orbit alien suns. Only eight planets call our solar system home. Or there might ...

(WHTM) – Our solar system has eight (was nine) planets and is roughly 4.571 billion years old. The planets in our solar system include Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune ...

A planetary conjunction is an astronomical event in which at least two planets – sometimes more – appear to our vantage from Earth to be close together in the sky. Both Venus and Jupiter are making ...