For a few evenings around 28 February, every planet in the solar system will be visible in the night sky, thanks to a rare great planetary alignment. Here's how to make sure you don't miss this ...

The entire solar system, ours at least, sits inside a pocket of low density called the Local Hot Bubble (LHB). This cavity in space is 1,000 light-years across, at least, and tips the thermometer at ...