Astronomy
esiegel | January 30, 2013"Concentrate all your thoughts upon the work at hand. The sun's rays do not burn until brought to a focus." -Alexander Graham Bell
Imagine a beautiful, clear day. The Sun is shining, the skies are clear, and you couldn't ask for a nicer day.
Image credit: © 2012 Free HD wallpapers.
All of a sudden, the Sun itself appears to brighten, just for a brief amount of time, like it released an extra burst of energy. That night, some 17 hours later, the most spectacular auroral display ever brightens the night in a way you never imagined.
Image credit: Jónína Óskarsdóttir.
Workers across the…
esiegel | January 28, 2013"A wise old owl lived in an oak
The more he saw the less he spoke
The less he spoke the more he heard.
Why can’t we all be like that wise old bird?" -The Immortal Poet Bromley
To your naked eye, the night sky appears littered with thousands of individual points of light: the stars and planets so familiar to us. But through even a small telescope or a pair of binoculars, not only do the number of visible stars increase into the hundreds-of-thousands or even the millions, but a slew of deep-sky objects become visible to us as well. Each monday, we highlight one of the deep-sky objects from…
esiegel | January 27, 2013"In any field, find the strangest thing and then explore it." -John Archibald Wheeler
Sometimes, things get difficult. Sometimes, there are challenges you have to face that you never even expected, much less were prepared for. And sometimes, it seems like there's no point in even holding on to hope that things will get better. But as long, as The National would tell you, as you're no
Runaway,
you've still got something worth striving for. Even if there's something newer, shinier, and more powerful than you.
Image credit: NASA / Hubble Space Telescope.
Even on Mars.
Nine years (and three…
esiegel | January 23, 2013“Hell must be isothermal; for otherwise the resident engineers and physical chemists (of which there must be some) could set up a heat engine to run a refrigerator to cool off a portion of their surroundings to any desired temperature.” -Henry Albert Ben
One of the most amazing ideas to come out of our observations of the Universe over the last century is that our vast, star-filled, mostly-empty Universe hasn't always been like this.
Image credit: Ricky Barnard / Fine Art America.
Today, the Universe is very cold, expanding, and the average distance between galaxies is increasing as time…
esiegel | January 21, 2013"Modern man must descend the spiral of his own absurdity to the lowest point; only then can he look beyond it." -Vaclav Havel
But the spiral is more than a metaphor or a mathematical shape, it's also the most common feature observed in the galaxies out there in the Universe. There are 27 spiral galaxies in the Messier Catalogue, and today I want to show you how to find the most southerly of them all!
Image credit: Rich Richins, of all 110 Messier objects (in no particular order). M83 boxed.
The Southern Pinwheel Galaxy, also known as Messier 83, is a full 30 degrees south of the celestial…
esiegel | January 18, 2013"The cosmos is all that is or ever was or ever will be. Our feeblest contemplations of the Cosmos stir us—there is a tingling in the spine, a catch in the voice, a faint sensation, as if a distant memory, or falling from a height. We know we are approaching the greatest of mysteries." -Carl Sagan
If you looked out at the planets in the Solar System orbiting our Sun, you'd expect that if you know where they are right now and how quickly they're moving, you can figure out exactly where they're going to be at any time-and-date arbitrarily far into the future. That's the great power that comes…
esiegel | January 16, 2013“Aristotle taught that stars are made of a different matter than the four earthly elements— a quintessence— that also happens to be what the human psyche is made of. Which is why man’s spirit corresponds to the stars. Perhaps that’s not a very scientific view, but I do like the idea that there’s a little starlight in each of us.” -Lisa Kleypas
Ah, but what if you did want the scientific view of starlight? After all, it's through the very stars themselves that we've unveiled some of the greatest secrets of the Universe.
Image (mosaic) credit: Nick Risinger.
But while the stars of the night…
esiegel | January 14, 2013"The ruins were just a reminder that what had been was no longer. That everything we are will be gone someday. That I will be forgotten." -Megan Miranda
Some four-and-a-half billion years ago, a ultra-massive cloud of cold gas and dust collapsed, giving rise to thousands of stars of all different types, from hot, massive, quick-burning blue stars down to low-mass, cool red dwarfs. And within a few hundred million years, that open star cluster dissociated, flinging the individual stars that once made it up throughout the galaxy. The lone remnant of that cluster known to us lights up our…
milhayser | January 9, 2013On Starts With a Bang, Ethan Siegel makes headway on his tour of "110 spectacular deep-sky objects" first cataloged by Charles Messier in 1758. Before powerful telescopes were developed, the heavens consisted of the sun, moon, stars, a few bright planets, and the rare passing comet. Comets were actively sought by men like Messier, who one night saw a bright smudge—too ill-defined to be a star—that "neither brightened nor changed position nor altered in appearance over the subsequent nights." He had spotted the beautiful Crab Nebula, an expanding lacework of stardust blown out by a…
esiegel | January 7, 2013"These are strange and breathless days, the dog days, when people are led to do things they are sure to be sorry for after." -Natalie Babbitt
The dog days may come at the tail end of summer, but it's the winter months that brings us the best views of the Dog Star, Sirius, the brightest star in all the night sky.
Image credit: Yuuji Kitahara.
And if you look towards the southeast in the early evening -- or towards due south around midnight -- you'll find Sirius twinkling wildly in the sky, brighter than all other stars (over three times brighter than Arcturus, the next brightest star visible…
esiegel | January 5, 2013"Stuff your eyes with wonder, live as if you'd drop dead in ten seconds. See the world. It's more fantastic than any dream made or paid for in factories." -Ray Bradbury
It wasn't all that long ago -- back when I was a boy -- that the only planets we knew of were the ones in our own Solar System. The rocky planets, our four gas giants, and the moons, asteroids, comets, and kuiper belt objects (which was only Pluto and Charon at the time) were all that we knew of.
Image credit: NASA's Solar System Exploration, http://solarsystem.nasa.gov/planets/index.cfm.
But these were just the worlds…
esiegel | December 31, 2012"I'd rather be a could-be if I cannot be an are;
because a could-be is a maybe who is reaching for a star.
I'd rather be a has-been than a might-have-been, by far;
for a might have-been has never been, but a has was once an are." -Milton Berle
Welcome to Messier Monday, where we pick one of the 110 spectacular deep-sky objects of the Messier catalogue each week and learn a little more about it.
Image credit: Paul Gitto's Messier Marathon.
This week, to usher in 2013, I'd like to take a look at Messier 13, the Great Globular Cluster in Hercules, which is visible to northern skywatchers both…
esiegel | December 28, 2012"People hear the happy story, but the truth is they could all disappear in the blink of an eye. The threats just keep coming." -Todd Steiner
It's taken generations of scientists, examining the night sky for millennia, to comprehend the full size and scope of what's out there in the Universe.
Image of the southern Milky Way, by A. Fujii.
Out beyond the planets and stars, outside of the Milky Way itself, is a great cosmic abyss filled with still-uncounted galaxies that stretch for billions of light years across the Universe.
Image credit: 2P2 Team, WFI, MPG/ESO 2.2-m Telescope, La Silla, ESO…
esiegel | December 27, 2012"Tell me what you feel in your room when the full moon is shining in upon you and your lamp is dying out, and I will tell you how old you are, and I shall know if you are happy." -Henri Frederic Amiel
Tonight is a special night, although not for the reasons you may think. Yes, it's just a few days after Christmas and before the new year, but tonight is the night of the Full Moon closest to the winter solstice.
Image credit: Judy Stone-Goldman.
Up here in the northern hemisphere (above the Tropic of Cancer), December 21st corresponds to the winter solstice, or the shortest day in terms of…
esiegel | December 26, 2012"We have been forced to admit for the first time in history not only the possibility of the fact of the growth and decay of the elements of matter. With radium and with uranium we do not see anything but the decay. And yet, somewhere, somehow, it is almost certain that these elements must be continuously forming. They are probably being put together now in the laboratory of the stars." -Robert Millikan
The Universe has been around for a long time, but without the Big Bang, we'd never have any of the matter or starlight that gives rise to practically all of our experiences in the entire…
esiegel | December 24, 2012"This holiday season is about remembering that the greatest gift was not laid under a tree, but in a filthy manger." -Unknown
But it isn't the manger you're thinking of that I want to share with you this Messier Monday. Although Charles Messier's catalogue of 110 deep sky objects -- designed to pinpoint nebulae that could possibly be confused for potential comets -- is composed mostly of objects only visible through a telescope, a few of them are visible under good seeing conditions to the naked eye, and have been known since ancient times.
Image credit: Finotto Enrico, 2011 / flickr user…
esiegel | December 20, 2012"I hope you feel things you never felt before. I hope you meet people who have a different point of view. I hope you live a life you’re proud of, and if you’re not, I hope you have the courage to start all over again." -Eric Roth, screenwriter
Forget the prognosticators, the fortune-tellers and the mediums. Pay no mind to the soothsayers, the prophets, the augurs and diviners. The seers see no more than any other sighted person, the omen-interpreters have been superseded by the ornithologists, the psychics made obsolete by the scientists.
Because if doomsday ever does approach, we won't be…
esiegel | December 19, 2012"Death comes to all, but great achievements build a monument which shall endure until the sun grows cold." -Ralph Waldo Emerson
In the great cosmic ocean, there's only one planet that we know -- for certain -- has the right conditions and history to result in intelligent life: our own.
Image credit: NASA, from the Space Shuttle, for Sun-Earth Day 2008.
Life -- or even intelligent life -- may be possible in environments vastly different than our own: around different classes of stars, at different temperatures, and even with different molecules and/or chemical elements.
But we know for…
esiegel | December 17, 2012“Men... have had the vanity to pretend that the world creation was made for them, whilst in reality the whole creation does not suspect their existence.” -Camille Flammarion
Welcome to the latest -- and most controversial -- Messier Monday, where each week, I'll take a look at one of the 110 deep-sky objects that make up the Messier catalogue. These objects were identified so as not to be confused with potential comets, and make up the brightest and best-known observational sights beyond our own Solar System. But there is one object that, if you go to the wikipedia list, that has not been…
esiegel | December 16, 2012"The vastness of the heavens stretches my imagination. It does not do harm to the mystery to know a little about it. For far more marvelous is the truth than any artists of the past imagined it." -Richard Feynman
What did you think about, wonder about, and dream about the first time you saw the true magnificence of the night sky? Did you wonder about planets orbiting each of the thousands of points of light you saw? Did you think about the possibilities of rocky worlds with liquid water, of life, and even of intelligent aliens? Or did you perhaps think on even larger scales, about what stars…