esiegel | December 8, 2013“Who is more humble? The scientist who looks at the universe with an open mind and accepts whatever the universe has to teach us, or somebody who says everything in this book must be considered the literal truth and never mind the fallibility of all the human beings involved?” -Carl Sagan
It's a challenging thing, to admit to ourselves how vast and mysterious this Universe is, and how small and ignorant we all truly are. It can feel daunting and isolating to think about it, and solace can be difficult to find, as Mazzy Star can maybe help you related to as you listen to their wonderful song…
esiegel | December 6, 2013"The results of my observation are best explained by the assumption that a radiation of very great penetrating power enters our atmosphere from above." -Victor Hess
You might think of the largest and most powerful particle accelerators in the world -- places like SLAC, Fermilab and the Large Hadron Collider -- as the source of the highest energies we'll ever see. But everything we've ever done hear on Earth has absolutely nothing on the natural Universe itself! For this week's Ask Ethan, let's take a look at the simple question of our reader David Hurn, who asks:
Ever since I was a young…
esiegel | December 5, 2013"Some say the world will end in fire,
Some say in ice.
From what I've tasted of desire
I hold with those who favor fire.
But if it had to perish twice,
I think I know enough of hate
To say that for destruction ice
Is also great
And would suffice." -Robert Frost
Depending on where you are in the world right now, you might really be feeling the effects of the emerging winter, as cold snaps, freezes and snowstorms take hold across the northern hemisphere.
Image credit: NASA's Scientific Visualization Studio, Goddard Space Flight Center.
But we can all be pretty sure that this is temporary,…
esiegel | December 2, 2013"Give me a man who says this one thing I do, and not those fifty things I dabble in." -Dwight L. Moody
While star clusters may dabble in a number of physically interesting things, there's one thing that they do above all others, and that is shine. For today's Messier Monday, where we spotlight one of the 110 deep-sky wonders of the Messier catalogue, let's take a look at one of the brilliant open clusters of stars that's recently formed in our neighborhood of the galaxy and that will appear all winter long: Messier 50.
Image credit: Greg Scheckler, using the robotic telescopes of http://…
esiegel | November 30, 2013"Unfortunately, I'm not one of those people who take pictures, you know, carry a camera. Because if I did I'd have stacks and stacks and stacks of different acts." -Edwin Starr
You've been outside enough to know that the deepest photos of the Universe -- of the night sky -- aren't quite the same thing you see when you open your gaze on even the darkest nights; there's often a lot more visible in the photos than there are to the unaided eye. As Earth, Wind & Fire would sing you (how's that for one from the vault), it might feel like you find yourself in a land called
Fantasy.
That's…
esiegel | November 29, 2013“If you see an antimatter version of yourself running towards you, think twice before embracing.” -J. Richard Gott III
It may not occur to you that it's a special thing that the Earth and everything found on it is made of matter; it seems intuitive that it couldn't be any other way. And yet, the very laws of nature themselves haven't yet told us why or how the Universe is this way! For this week's Ask Ethan (and leave your own questions or suggestions here), our regular reader Michael Fisher wants us to get at the heart of this, asking:
Is it true that in the early universe matter &…
esiegel | November 27, 2013“I have announced this star as a comet, but since it is not accompanied by any nebulosity and, further, since its movement is so slow and rather uniform, it has occurred to me several times that it might be something better than a comet. But I have been careful not to advance this supposition to the public.” -Giuseppe Piazzi
So it begins again: the neverending debate about who gets to be a planet and who doesn't. Everyone can bring their own interpretation of the science to the table -- and everyone has their own preferred naming scheme -- but when I think about the Solar System, I try to…
esiegel | November 25, 2013"Anyone who keeps the ability to see beauty never grows old." -Franz Kafka
The night sky is our window into the Universe beyond the Solar System, and in some cases, even beyond our own galaxy! Perhaps the oldest useful collection of deep-sky objects, the Messier catalogue showcases 110 of the most prominent night sky wonders, a full 42 of which are located beyond our own galaxy. Today, for Messier Monday, let's take a look at one of the true rarities of the Messier catalogue: a globular cluster that's not a part of our own galaxy!
Image credit: Al Kelly of http://www.kellysky.net/; images…
esiegel | November 24, 2013"Education is a continual process, it's like a bicycle... If you don't pedal you don't go forward." -George Weah
I don't know how many of you out there have an office day job, sitting hunched over at a desk for the better part of 8+ hours a day, but it's pretty well known that it's not only bad for you, but it feels bad to do, physically. Staying in one motionless position or posture for too long is the culprit, and Leo Kottke's music might make you want to get up and move if you have a listen to his song,
Busted Bicycle.
And while there are options out there for those of you with autonomy…
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 16, 2013"I like to compare the holiday season with the way a child listens to a favorite story. The pleasure is in the familiar way the story begins, the anticipation of familiar turns it takes, the familiar moments of suspense, and the familiar climax and ending." -Fred Rogers
I know it's still the middle of November, but I know that many of you are already thinking about holiday gifts for the lovers of physics, astronomy and the Universe in your life. People send me books and other educational materials throughout the year for review, and although they all have good and bad points about them, I'm…
esiegel | November 15, 2013"I wouldn't know a spacetime continuum or a warp core breach if they got into bed with me." -Patrick Stewart
It's the end of the week once again, and so it's time for another Ask Ethan segment! There have been scores of good questions to choose from that were submitted this month alone (and you can submit yours here), but this week's comes from our reader garbulky, who asks:
Why does gravity decrease the further away you are from the object? I've read that it does decrease with distance squared but not why it does this.
This question seems so simple, and yet the answer -- to the limits of our…
esiegel | November 13, 2013"Ours is a world of nuclear giants and ethical infants. We know more about war that we know about peace, more about killing that we know about living." -Omar N. Bradley
Nuclear physics is one of the most daunting, emotionally charged phrases in all of science. You can hardly say the words without the image of a mushroom cloud popping into most people's heads, followed by the devastations of radiation sickness and lingering radioactivity.
Image credit: National Archives image (208-N-43888), Charles Levy, of the Nagasaki bomb.
But -- as a physicist -- that's not what I think of at all.
Think…
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 10, 2013"My idea of perfect happiness is a healthy family, peace between nations, and all the critics die." -David Mamet
As a theorist in physics, most of my research time is spent looking for errors in painstaking calculations, writing and running simulation code, and trying desperately to connect some very abstract concepts to potential observables in either experiments or the Universe.
But for experimentalists, the key difficulty is always some variation on one unifying theme: getting good data. That's why this weekend, I'm proud to bring you a fantastic takeoff of Daft Punk's Get Lucky by the…
esiegel | November 9, 2013"One of the most tragic things I know about human nature is that all of us tend to put off living. We are all dreaming of some magical rose garden over the horizon instead of enjoying the roses that are blooming outside our windows today." -Dale Carnegie
Our new Ask Ethan segment has been really popular, and the questions and suggestions keep pouring in. It's your Universe too, and if there's something you want to know about it, you should ask! (So keep it up!) This week's question is one of the biggest of them all, and it comes courtesy of John L. Ferri, who asks,
I have a difficult time…
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…