During just one night – 28 February – they will be joined by Mercury, a rare seven-planet alignment visible in the sky. It is a spectacle that will not be visible again until 2040. But such ...

Feb. 18 marks the 95th anniversary of the discovery of our outermost planet-not-planet ... Just Served Us Nine Pizzas" to remember the order of the planets in the solar system: Mercury, Venus ...

If you've got any interest in skygazing, this is your week. A stunning planet parade is now visible in the night sky. A planet parade is when several of our solar system's planets are visible in ...