There are 182 moons (and counting) in the solar system orbiting planets; there are a bunch more orbiting planetoids. Read on for all your moon facts. [more inside]
We know space is big, but trying to understand how big is tricky. Say you stare up at the sky and identify stars and constellations in a virtual planetarium, you can't quite fathom how far away all those stars are (previously, twice). Even if you could change your point of view and zoom around in space to really see 100,000 nearby stars (autoplaying ambient music, and there are actually 119,617 stars mapped in 3D space), it's still difficult to get a sense of scale. There's this static image of various items mapped on a log scale from XKCD (previously), and an interactive horizontal journey down from the sun to the heliosphere with OMG Space (previously). You can get a bit more dynamic with this interactive Scale of the Universe webpage (also available in with some variants, if you want the sequel [ previously, twice], the swirly, gravity-optional version that takes some time to load, and the wrong version [previously]), but that's just for the scale of objects, not of space itself. If you want to get spaced out, imagine if If the Moon Were Only 1 Pixel, and travel from there (previously). This past March, BBC Future put out a really big infographic, which also takes a moment to load, but then you can see all sorts of things, from the surface of Earth out to the edge of our solar system.
If the Moon Were Only 1 Pixel is a tediously accurate model of the Solar System that Josh Worth made to explain to his daughter just how difficult it is to go on holiday to Mars.
I am a staunch believer in leading with the bad news, so let me get straight to the point. Earth, our anchor and our solitary haven in a hostile universe, is in a precarious situation. The solar system around us is rife with instability.[more inside]
Scott Carpenter has died at 88. As the commander of Aurora 7 in 1962, Carpenter was the second Mercury astronaut to orbit the Earth. He is best known for having wished his friend John Glenn "Godspeed" as the latter launched into orbit. [more inside]
The cosmos is also within us, we're made of star-stuff. We are a way for the cosmos, to know itself.
Cosmos: A Personal Voyage is a thirteen-part television series of one hour shows written by Carl Sagan, Ann Druyan, and Steven Soter, that was aired at the tail end of 1980 and was - at the time - the most widely watched series in the history of American public television. It is best introduced by an audio excerpt of one of his books, The Pale Blue Dot. Inside is a complete annotated collection of the series. [more inside]
Transit of Mercury again. here Transit of Mercury again. Today -- and not for another seven years or so -- Mercury passes between the Earth and the Sun, shwoing up a speck-like black circle. But don't look. Starting times, real-time visual, ways to see it and another caution are here. rotoman
At forty miles (64.4 km) from Pluto to Sun, the Maine Solar System Model is the largest complete three-dimensional scale model of the solar system in the world. What, you didn't know there was more than one? And yes, Pluto is staying put.
The MESSENGER spacecraft launched from Cape Canaveral on August 3, 2004 and returned to Earth for its first gravity boost on the way to Mercury a year later on August 2, 2005. MESSENGER took hundreds of high-res digital photos during its Earth flyby and they've been sequenced into an amazing movie of Earth rotating over 24 hours as the spacecraft swung past at thousands of miles per hour.
Stop the world, I want to get off: A group of scientists thinks that a "wobble" in the orbits of Earth and Mercury may have attracted an asteroid, and not a stray comet, to hit the Earth and wipe out the dinosaurs.