What Cassini taught us about Saturn

In 2017, the Cassini spacecraft, which had spent nearly two decades working in orbit around Saturn, ended its mission in a “Grand Finale.” But before the spacecraft went out in a blaze of glory by plunging into the planet’s atmosphere, it recorded subtle gravitational changes, which astronomers have now used […]

How will life on Earth end?

Astronomy/Roen Kelly Life is resilient. The first living things on Earth appeared as far back as 4 billion years ago, according to some scientists. At the time, our planet was still being pummeled by huge space rocks. But life persisted anyway. And throughout Earth’s history, it’s seen all manner of […]