Looking for molecular evidence of life on other worlds is tricky, but a test based on the reactivity of carbon compounds ...

Venus and Saturn are due up for a visually striking event known as a planetary conjunction. Here's everything to know about when and how to see it.

Everyone knows Yuri Gagarin as the first person to go to space. But was he? Physicist Vladimir Brljak tells the tale of the intrepid balloonists who first flew beyond the blue terrestrial sky, challen ...