Planetary scientists say a Pluto-sized object slammed into Mars 4 billion years ago, removing nearly half the planet's crust and flattening its northern hemisphere.

Astronomers have defined "plutoids" as a new category of Pluto-like objects in the outer solar system.

Travel can put the body’s rhythms slightly out of whack. For professional baseball players, that may mean more lost games.

Science News for Kids reports on a close-up examination of the crystal skulls that inspired the Hollywood blockbuster Indiana Jones and the Kingdom of the Crystal Skull suggests the artifacts, once thought to be some 500 years old, were made in the 19th or 20th century.

Scientists have identified 23 new compounds that could make better bug sprays than those used today.

Using a computer model, scientists calculated that air pollution quickly destroys the scents that flowers release and may make it harder for butterflies, bats and other pollinators to find sources of food.

Climate change affects the timing of flowering, migration and other natural cycles, meaning spring is coming earlier in many parts of the world.

A squishy squid has some chemical tricks that help it hold on to its tough, rigid beak without hurting itself. Squids look soft and squishy — and for the most part, they are. Yet a squid's beak — the rigid part of its mouth — is hard enough to snap a fish's spine with just one bite. Biting a bone in two requires considerable force. But how can the squid's squishy soft mouth hold on to the beak without cutting itself against the beak's rigid edge? Somehow, the soft tissues in the squid's mouth must resist the force generated by the strong chomp. It’s a puzzling questio...

Even though there’s a vaccine to protect against it, more than 6,000 people in the United States caught a disease called mumps in 2006.