The Carl Sagan Portal
The Planetary Society
0.10-bortle.jpg from stellarium.org
NASA Spitzer Space Telescope
Interactive 3D model of Solar System Planets and Night Sky
The Scale of the Universe Light travels at 300,000 kilometres per second (186,000 miles per second). In one second, a beam of light can travel SEVEN TIMES around the Earth. This table shows a number of distances to various objects expressed in terms of how long a beam of light takes to travel that distance.
Scale of Universe - Interactive Scale of the Universe Tool
Large-scale structure of the Universe
HubbleSite - Out of the ordinary...out of this world.
Some cells are visible to the unaided eye The smallest objects that the unaided human eye can see are about 0.1 mm long. That means that under the right conditions, you might be able to see an ameoba proteus, a human egg, and a paramecium without using magnification. Cell Size and Scale
Alien Earths Online - www.alienearths.org
Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. 2014 January 9 The Tadpoles of IC 410 Image Credit & Copyright: Martin Pugh Explanation: This telescopic close-up shows off the otherwise faint emission nebula IC 410 in striking false-colors. It also features two remarkable inhabitants of the cosmic pond of gas and dust below and right of center, the tadpoles of IC 410. Astronomy Picture of the Day
The Elegant Universe: Part 3 PBS Airdate: November 4, 2003 NARRATOR: Now, on NOVA, take a thrill ride into a world stranger than science fiction, where you play the game by breaking some rules, where a new view of the universe pushes you beyond the limits of your wildest imagination. This is the world of "string theory," a way of describing every force and all matter from an atom to earth, to the end of the galaxies—from the birth of time to its final tick, in a single theory, a "Theory of Everything." Our guide to this brave new world is Brian Greene, the bestselling author and physicist. BRIAN GREENE (Columbia University): And no matter how many times I come here, I never seem to get used to it. NOVA | The Elegant Universe | Watch the Program (full-screen)
Astronomy Magazine - Interactive Star Charts, Planets, Meteors, Comets, Telescopes
The Chandra X-ray Observatory Center :: Gateway to the Universe of X-ray Astronomy!
The Universe in Colour