Astronomy
esiegel | November 22, 2013“Light thinks it travels faster than anything but it is wrong. No matter how fast light travels, it finds the darkness has always got there first, and is waiting for it.” -Terry Pratchett
It’s the end of the week once again, and so let's have a go at another Ask Ethan! Perhaps inspired by a great giveaway, there have been so many great questions pouring in (and you can submit yours here for four more chances to win), but this week’s comes from our reader and winner Brad (you owe me your email address, Brad), who asks,
When an object is quoted as being 13.8 billion light years away is that…
esiegel | November 21, 2013"Mars once was wet and fertile. It's now bone dry. Something bad happened on Mars. I want to know what happened on Mars so that we may prevent it from happening here on Earth." -Neil deGrasse Tyson
Oh, it's true alright, something bad did once happen on Mars. And although there isn't any real danger of that happening to Earth, a little conversation I had earlier this week made me think that it's time to tell all of you a story about our red neighbor, and why it is the way it is today.
You see, when we think about Mars, we think about the smallish, red, desolate world that fascinates us today…
esiegel | November 18, 2013“Once you have tasted flight, you will forever walk the Earth with your eyes turned skyward, for there you have been, and there you will always long to return.” -Leonardo da Vinci
Welcome back to another exciting Messier Monday here on Starts With A Bang! As Comet ISON dives towards the Sun and a nearly perfect full Moon towers overhead, it's easy to forget about those wondrous deep-sky objects that are fixed, but the 110 prominent members of the Messier Catalogue are always on tap for dedicated skywatchers. Although the extended objects -- galaxies and nebulae -- are difficult to view with a…
esiegel | November 11, 2013"Books serve to show a man that those original thoughts of his aren't very new at all." -Abraham Lincoln
It might be Veterans Day / Armistice Day all around the world, but it's still Messier Monday here on Starts With A Bang! We may have been fighting wars for all of human history, but nearly all of the 110 deep sky objects that make up the Messier Catalogue go back long before that.
Image credit: Tenho Tuomi of Tuomi Observatory, via http://www.lex.sk.ca/.
Today, we take an in-depth look at one of the brightest and closest star clusters in the entire night sky, one that -- despite being…
esiegel | November 6, 2013"I conclude, therefore, that this star is not some kind of comet or a fiery meteor... but that it is a star shining in the firmament itself one that has never previously been seen before our time, in any age since the beginning of the world." -Tycho Brahe
I want to take you back in history, back to the middle of the 1500s. Night skies were spectacular, even from the world's most cosmopolitan cities, and thousands of stars consistently graced the sky, sights only visible from a few select locations in the world these days.
Image credit: Lennox & Addington County Dark Sky Viewing Area, via…
esiegel | November 4, 2013"Dream no small dreams, for they have no power to move the hearts of men." -Johann Wolfgang von Goethe
Welcome back to yet another Messier Monday here on Starts With A Bang! Each Monday, we highlight one of the 110 deep-sky objects that make up the Messier catalogue, showing you where and how to find it in the sky and telling you a bit about the history and the physics/astrophysics behind it. Each one tells its own unique story, and today's distant wonder is no exception.
Image credit: Rich Richins, of all 110 Messier objects (in no particular order).
On a virtually moonless night like…
esiegel | October 28, 2013"I should like to lie at your feet and die in your arms." -Voltaire
Every object that we look at for Messier Monday has its own flavor, its own qualities, and its own unique characteristics. By far the most numerous of the 110 deep-sky objects making up the Messier catalogue are the galaxies, of which there are 40. It's best to observe them on moonless nights, as their surface brightness is spread out across a large area, and even a crescent Moon's presence in the night sky can make all but the brightest of these galaxies invisible to the eye, even in good equipment.
Image credit: Mike Keith…
esiegel | October 26, 2013"If it's true that our species is alone in the universe, then I'd have to say the universe aimed rather low and settled for very little." -George Carlin
Whatever you may think of the chances are for intelligent life in our galaxy are today, I can guarantee you they're going to go up dramatically in a few billion years. Sure, by that time the Earth may be a little too hot for comfort, and in that sense -- as Split Lip Rayfield would say -- we'll probably
Never Make It Home.
But that doesn't mean there won't be a new-and-improved home out there, not only from among the stars and planets in our…
esiegel | October 25, 2013"I have just gone over my comet computations again, and it is humiliating to perceive how very little more I know than I did seven years ago when I first did this kind of work." -Maria Mitchell
Well, it's getting close to the end of October, the Moon is waning towards its new phase, and -- at least in the northern hemisphere -- the days are getting shorter and the nights are lengthening. Is there anything unique on its way that's worth watching the skies for? In today's Ask Ethan column, our suggestion comes from longtime reader and commenter Sinisa Lazarek, who inquires:
Since ISON comet is…
esiegel | October 21, 2013"Controversy is only dreaded by the advocates of error." -Benjamin Rush
Welcome back to another Messier Monday! Each week, we take an in-depth look at one of the 110 deep-sky wonders of the Messier Catalogue, from distant galaxies to nearby star clusters, from nebulous star factories to ancient globular bunches, and from stellar remnants to the rare-but-interesting anomalies. There are only three such anomalous entries out of all 110 Messier objects, and today provides us with a fantastic opportunity to take an in-depth look at one of them.
Image credit: The Messier Objects by Alistair Symon…
esiegel | October 17, 2013"It is not when truth is dirty, but when it is shallow, that the lover of knowledge is reluctant to step into its waters." -Friedrich Nietzsche
Although the innermost planets, from Mercury through Saturn, were known since ancient times, it's only since the advent of the telescope that we've discovered what really lives in our Solar System. Over the past four centuries, the wonders of not only the distant Universe, but also our nearby neighborhood, have been uncovered in spectacular detail.
Image credit: NASA and – I believe – G. Bacon (STScI).
The third and fourth largest planets were…
esiegel | October 14, 2013"The deeper reason we fear our own glory is that once we let others see it, they will have seen the truest us, and that is nakedness indeed. [...] It is an awkward thing to shimmer when everyone else around you is not, to walk in your glory with an unveiled face when everyone else is veiling his." -John Eldredge
Welcome back to another Messier Monday, where the glittering wonders of the night sky -- visible to anyone at the right latitudes with even simple equipment -- are on display for everyone. The bright collection of 110 deep-sky wonders include star clusters, globular clusters, galaxies…
esiegel | October 11, 2013"If you look for truth, you may find comfort in the end; if you look for comfort you will not get either comfort or truth only soft soap and wishful thinking to begin, and in the end, despair." -C. S. Lewis
And yet, when you search for the truth, you often find answers that butt up against your sensibilities, your preconceptions, and even your very notions of common sense. Such is the case in this week's Ask Ethan, where longtime reader and commenter MandoZink asks:
I have a question that has perplexed me for most of my life. Recently I sought out and re-read more expert explanations of the…
esiegel | October 9, 2013"Even in hindsight, I would not change one whit of the Voyager experience. Dreams and sweat carried it off. But most of all, its legacy makes us all Earth travelers among the stars." -Charley Kohlhase
In the early days of space exploration, it was quite a feat just to get up and out of Earth's atmosphere. There's are two good, simple reason for that, of course: first, it takes a lot of energy to go up that high...
Image credit: Nathan Bergey of http://psas.pdx.edu/orbit_intro/.
and second, if you don't get your spacecraft moving really fast, you're just going to fall back to Earth once you…
esiegel | October 7, 2013"The battle, sir, is not to the strong alone; it is to the vigilant, the active, the brave." -Patrick Henry
It's not a good idea to showcase a galaxy for you every Messier Monday, considering that even a crescent Moon can render most of them completely unobservable. Now that the autumnal equinox has passed, however, a very special spiral will be visible after sunset for the next six months or so in a relatively nondescript part of the night sky. Out of the 110 deep-sky objects that comprise the Messier catalogue, a full forty of them are galaxies, although today's object wasn't recognized as…
esiegel | October 2, 2013"Ignorance more frequently begets confidence than does knowledge: it is those who know little, and not those who know much, who so positively assert that this or that problem will never be solved by science." -Charles Darwin
There are problems with science today, no doubt. With all the knowledge we've accumulated about the Universe, from the smallest subatomic scales to the farthest recesses of deep space, there are still realms and regimes where our best theories fail, where the predictions and the data don't match, and where no known explanation is sufficient for the phenomena that shows up…
esiegel | September 30, 2013"It is by going down into the abyss that we recover the treasures of life. Where you stumble, there lies your treasure." -Joseph Campbell
It took Charles Messier and his assistant, Pierre Méchain, a lifetime to scan and survey the sky for all the permanent deep-sky objects visible in their telescopes that could possibly be confused for comets on first class. More than 200 years later, these 110 deep-sky objects are among the best seen and most wondrous sights of the Universe, accessible to anyone with a decent telescope and dark skies. This Messier Monday, let's look the farthest into the…
esiegel | September 27, 2013"I have an existential map. It has 'You are here' written all over it." -Steven Wright
So just because the Ask Ethan series is becoming way more popular than I can handle -- I've got more than 200 questions that I'm sitting on by now -- doesn't mean you should stop sending your questions! There are some really good ones, and today's comes from Robert Plotner, who asks:
When maps of the CMB are depicted, they are shown as a flattened ovoid. How does this correlate to our view of the sky which is a sphere? For example, a global map of the Earth is either distorted to show it in two dimensions…
esiegel | September 23, 2013"I would rather have one article a day of this sort; and these ten or twenty lines might readily represent a whole day's hard work in the way of concentrated, intense thinking and revision, polish of style, weighing of words." -Joseph Pulitzer
When it comes to the Messier objects, though, it isn't words that get concentrated; its collections of stars, gas, dust and more! So welcome to another edition of Messier Monday, where we take an in-depth look at one of the 110 deep-sky objects that make up the Messier catalogue. Some of these objects are only a few light-years wide, containing just a…
esiegel | September 16, 2013"Now, this is not the end. It is not even the beginning of the end. But it is, perhaps, the end of the beginning." -Winston Churchill
To kick off every week for nearly a year now, we've begun it with Messier Monday, where we take an in-depth look at the 110 deep-sky objects that make up the first elaborate catalogue of fixed night-sky wonders that could possibly be confused for transient comets. Originally, when first published, this catalogue was made up of 103 objects; the final 7 were added posthumously. Each one tells its own unique story, yet all of them tell a sliver of our own story,…