Constellations throughout the ages ☆ Sun replaced with other stars ☆ Moon replaced with other bodies
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.
Missed the transit of Venus in 2004? Want to know if you'll be able to see the transit on June 5/6 from your location? Want a free badge-of-geekhood app for your iPhone? It's all right here! [more inside]
"As noted elsewhere, more men have walked on the moon than have successfully photographed the analemma." (details) [more inside]
On July 5th the SOlar and Heliospheric Observatory (SOHO) captured video of a comet, known as a sungrazer, in route to collide with our star. SOHO is equipped with an occluding coronograph that blocks direct sunlight and reveals the corona, but also prevents direct study of the terminal impact of sungrazers. But on July 6th, with the help of the Solar Dynamics Observatory (SDO), astronomers were able to observe the comet (slyt) streaking in front of the surface of the sun for the first time in history. It likely disintegrated before impact due to extreme heat and radiation.
The most detailed photo of the surface of the sun looks like this. It was taken by the team at CA's Big Bear Solar Observatory. They have some other neat images of our nearest star at their website. [more inside]
...the lyrics to that last song were basically taken from an encyclopedia written in the 50s, and since the 50s, some remarkable things have happened...In 1959, a number of songs about science were released on an album called Space Songs. One of these was later covered by the band They Might Be Giants: Why Does The Sun Shine? (The Sun Is A Mass of Incandescent Gas). Only one problem: it isn't--the song was based on an incorrect text from 1951. So they wrote an answer song to themselves: Why Does The Sun Really Shine? (The Sun Is a Miasma of Incandescent Plasma). Bonus link: see for yourself! (previously)
Solar activity normally follows an 11-year cycle. The new cycle was originally predicted to start in early 2008, but despite a few sunspots appearing last year, the Sun still features a remarkable lack of activity - the deepest minimum since 1913. However, NASA's STEREO mission has seen indications that activity is increasing again, in the form of a coronal mass ejection (video [.mov, 3.3 Mb]), with an accompanying radio burst.
Atlantis. Hubble. And a big, yellow friend. Astrophotographer Thierry Legault managed to get amazing shots of Space Shuttle Atlantis approaching the Hubble Space Telescope during a transit of the sun. [more inside]
The Thirteen Towers of Chankillo in Peru may be the Western Hemisphere's oldest known full-service solar observatory, showing evidence of early, sophisticated Sun cults, according to archaeoastronomy professor Clive Ruggles. The 2,300-year-old complex featured 13 towers running north to south along a ridge and spread across 980 feet to form a toothed horizon that spans the solar arc. Last year, another ancient observatory was discovered in Peru by Robert Benfer. The Temple of the Fox is 4,200 years old, making it 1,900 years older than the Chankillo site, but wasn't a complete calendar.
Last night there was a pretty cool coronal ejection that ought to be arriving shortly. When it does, expect Auroral activity as far south as Tennessee. (Or Northern Italy. Or New Zealand.) [Via MonkeyFilter]
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
The sun is solid (this has beautiful images, btw). The earth is fixed, or maybe growing; relativity is wrong, and so is most of current thinking... For the intriguing as well as the insane, visit the fringes of science.
The largest solar flare of the current solar cycle shot off the sun earlier today. After the media latched on to what was predicted to be mostly a non-event last week (probably due to a NASA article released around the same time about a super spacestorm) , it's not making as much news this time. But you should pay attention this time. This could be the best and last chance for a lot of us farther south to see some auroras before the sun dives into solar minimum, assuming all the variables line up correctly this time. I recommend watching the Solar Terrestrial Dispatch, as it is a great all around resource for solar activity and auroras that includes live data and sightings reports by the general public. Unfortunately though, no doubt as word IS spreading, that site is being hammered again and may be quite slow.
A Doomed planet orbiting a distant star has been located. No, not Krypton. The planet is going to be consumed by the star soon, but astronomers are not going to wait up for it.
A very well designed site on the Analemma. Don't be scared off by the math, as there are excellent diagrams and quicktime movies on this difficult to visualize phenomena. Difficult, but not impossible, to photograph (probably less than 10 photos are in existence) Ulrich Bienert came close, and has a gallery and some tips if you're so inclined.
Sol: A Great Big Ball of Burning....Iron? Well that's what a UMRolla professor thinks anyway -- instead of being mostly hydrogen, that the sun is actually mostly iron. He's going against all popular belief, and indeed lots of evidence, but his theory states that our sun formed around the iron core of an old supernova.
Barbecue Wings A £900,000 mirror sculpture destined for a square in Nottingham, UK, will have to be shielded to prevent it focusing the Sun's rays and barbecuing passing birds. Anish Kapoor's highly polished concave steel mirror is six metres in diameter. Direct sunlight hitting the mirror would be focused into a narrow beam of light as hot as the surface of the Sun, says astronomer Michael Merrifield of Nottingham University.