♥ A graphic showing all 8 planets in our solar system, Mercury through to Neptune, to scale where one pixel = 279.6 km. Scales were worked out with this very useful solar system scale calculator. Find out more about the planets on the Planet Facts page.
♥ The “Black Widow” pulsar is moving through the galaxy at a speed of almost a million kilometers per hour. A bow shock wave due to this motion is visible to optical telescopes, shown in this image as the greenish crescent shape. The pressure behind the bow shock creates a second shock wave that sweeps the cloud of high-energy particles back from the pulsar to form the cocoon.
Heart nebula - Credit: NASA
Pinner said : Rock my world.... yeah, but what worries me is what one NASA scientist said in Discovery Channel interview: he's worried that there are no signals from any higher form of life. Because of Deep Space and Deep Time, and Earth is so new and humans are even much much newer, there's been plenty of time for signals to be sent out and for our area to be receiving them. Where is everybody? Have they died off? Pulled in signals because space is dangerous? or, maybe we are alone.......
The largest known structure in the universe, a clump of active galactic cores that stretch 4 billion light-years from end to end. The structure is a light quasar group (LQG), a collection of extremely luminous Galactic Nulcei powered by supermassive central black holes.