Much of Earth’s life-giving carbon could have been delivered in a planetary collision about 4.4 billion years ago, a theory suggests.
Each dot in this image is an entire galaxy. Each galaxy contains up to 1 trillion stars.
Each star may have a system of orbiting planets. There are over 10,000 galaxies in this photo alone.
Over the course of a few years, a previously inconspicuous star named Eta Carinae grew brighter and brighter, eventually outshining all other stars except Sirius, before fading again over the next decade, becoming too dim to be seen with the naked eye.
They say real estate is the best investment around and now savvy entrepreneurs have the opportunity to get in on the ground floor of interplanetary land speculation.
Crisscrossed grooves and chains of small craters cover the Martian moon Phobos. Astronomers have disagreed about what caused this strange-looking landscape for decades, but new research may help settle the debate.