Video

Lightyear FM

Want a perspective on what flying through space might actually look like?  Here’s one project to give you an idea.  Working on the knowledge that radio waves travel at the speed of light, this simulation shows you the local neighbourhood near Earth (excluding exoplanets) up to the limit of the first Earth radio broadcasts; up to 110 years ago (as of 2015).

Things I learned from this:

  • In general, stars don’t float randomly by themselves.  They appear in clusters.  We’re part of a pretty little cluster of mostly much tinier, dimmer stars than our own, that might look like the Pleiades with a red-shift in someone else’s perspective.
  • We can infer that most of the stars near us are smaller/dimmer than our own because most of them have alpha-numeric names (more on that in a minute).  Also, stars progress from red to orange to yellow to white to blue in terms of brightness and most of the stars around us are more orange than we are.
  • Every once in a while you do get singular stars just floating in a void, but it’s the exception, not the rule.
  • There are two nebulae relatively near to us.  One’s about 40 light years away and the other is about 80 light years away.  Each is about 10 light years across.

Naming conventions of stars:

  • The oldest stars we know about have proper names.  Those tend to be the brightest from our perspective and are typically the ones visible with the naked eye.  Most such names are derived from the Arabic language.  You’ll see relatively few of them in our local neighbourhood (Sirius, Fomalhaut, Pollux, etc.)
  • Sometimes stars are named for astronomers or the people who discovered them.  You’ll see a couple of those in this simulation.  One of them, Barnard’s Star, which you’ll see right after the Centauri stars that are our closest neighbours, blasted right through the edge of our solar system only 70,000 years ago!  Talk about a near-miss!
  • Some stars are catalogued.  The Bayer Designation names stars by a lower case Greek letter generally representing its corresponding number, plus the constellation it appears in. (ie. Sigma Sagittarii).  Once all 26 Greek letters have been assigned, letters of the Arabic-derived alphabet are used (ie. G Scorpii).  Sometimes when concurrent stars were discovered (like, say the smaller star in the Alpha Centauri binary) it was designated with a superscript.  The Flamsteed Designation is used when no Bayer Designation exists or when the Bayer designation uses numeric superscripts, because it’s less awkward.  (ie. 61 Cygni).  These stars are usually visible with a decent telescope.
  • The most recently discovered stars, visible with ultra high resolution or space telescopes and tracked by computers, are named with an alpha-numeric designation based on their position in the sky.  Over 990 million such objects exist.
  • Special cases: Pulsars are designated by the prefix PSR, with a series of hyphenated numbers in which the first indicates its right ascension and the second its degree of inclination.  Supernovae are designated by the prefix SN, plus the year they were discovered in, and if there was more than one, a letter indicating the order of discovery (ie. SN 1987A.)  A few supernovae are known by the year they occurred in (ie. SN 1604, also known as Kepler’s Star).  Novae are usually given a name according to the naming convention of the General Catalogue of Variable Stars, which includes a number or letter designation and the constellation it’s from (ie. V841 Ophiuchi, SZ Persei, T Bootis.)

Here’s a preview to show you what it looks like: you can find the simulation itself at Lightyear.fm.  Note that if you hover your cursor over each celestial body (save the Earth, the Moon and the Sun) it will tell you what it is and how far away from Earth it is.  Enjoy the simulation!

Lightyear.fm – An interactive journey through space, time, & music from chris baker on Vimeo.

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Symphonies of the Planets

Although space is a virtual vacuum, this does not mean that there is no sound in space.  Sound does exist as electromagnetic vibrations.

Through specially designed instruments, the Voyager, INJUN 1, ISEE 1, and HAWKEYE space probes used Plasma Wave antenna to record the vibrations of the planets that they visited that are within the range of human hearing (20 to 20,000 Hz).

To be fair, however, they are often quiet; quiet enough that they are difficult, if not impossible, for the human ear to hear.

The recorded sounds are the complex interactions of charged electromagnetic particles from the Solar Wind, ionospheres, and planetary magnetospheres.  Here’s a sample of some of the recordings released by NASA:

Here is a recording (and photos) of the noise of the Singing Comet, 67P, as recorded by the Rosetta spacecraft (though in this case the volume has been increased by 10,000 times):

And here is a full playlist of the Symphony of the Planets.  These five CDs, which are now out of print, were created from the complex sounds recorded by the Voyager probes.

Yes, really.  This is real world stuff I’m talking about, not just Arcane Space!

So if you’d like to imagine what it sounds like aboard a Spelljamming ship, picture that the closer you got to a planetary body, the more of this kind of sound you would hear.  It would start as faint, water-like popping noises.  Then you would wonder when the wind noise had started.  Then you might notice a high-pitched drone like a wet finger on crystal or a Tibetan singing bowl.  In some cases (Suns, large planetary bodies) you might notice a low droning buzz, like the sound of a WWII airplane.  The closer you got to the planetary body, the louder it would get, and when you reached a planetary gravity plane, it would be a veritable cacophony to ears accustomed only to the creak of the ship, the flap of sails and the quiet of the Void; which would fade again into the background once you hit atmosphere and terrestrial noises began to reach your ears.  Or you might be sailing along in space, likely with continual distant popping sounds that would be more rapid the closer you were to the center of the sphere, and all of a sudden a Solar Gale might whip wind and ringing and high-pitched drones through the air envelope.  In which case, a sargasso might be heralded by a sudden, deafening silence.

 

Space telescope spies dwarf planet Ceres spewing water plumes

This undated artist’s concept released by NASA and UCLA shows the Dawn spacecraft with Ceres and Vesta. After four years sailing through space, the Dawn spacecraft was expected to slip into orbit late Friday around a giant asteroid Vesta to begin a yearlong investigation into the origins of the solar system.

Read the story here. That’s two in the system . . .

Scientists find evidence of hot springs beneath icy surface of tiny Saturn moon

This June 28, 2009 image provided by NASA, taken by the international Cassini spacecraft, shows Enceladus, one of Saturn’s moons. (AP / NASA)

Read the story at this link. Exciting stuff for us Spelljammer fans: what a perfect world for orcs or drow to inhabit!