Astronomy
esiegel | December 14, 2012"And in the end
The love you take
Is equal to the love you make." -Paul McCartney
Every once in a while, I throw the chance out there (on facebook, twitter, or google+) to ask me whatever questions you want. Yesterday, for some insane reason, I invited people across all three platforms to ask me whatever they liked, with a dual promise that I'd not only answer them, but that the best ones would receive a free "The Year In Space" calendar for 2013, courtesy of the Planetary Society.
Image credit: The Planetary Society.
So I got a ton of questions, and now I'll do my best to answer them as…
cevans | December 13, 2012"This one will look like a jellybean," the session director warns us. "Or, you know, when you empty a hole punch? The circles of paper that fall out? One of those." She's talking about Neptune, and I am about to step, carefully, up a ladder painted industrial yellow and wheeled into place in front of the centenarian eyepiece of the 60" Hale telescope at Mt. Wilson Observatory, incidentally the very place where Edwin Hubble, in 1925, discovered that our galaxy was not the entirety of the Universe, and later, that our Universe was expanding.
A jellybean, a piece of confetti: it seems her…
catdynamics | December 12, 2012
Dr Brad Barlow was nominated by his Astro 001 students for a great honour - whichever class collected the most money for this year's THON would get to designate a lecture style of their choice, and Brad won...
so he got to lecture as a character from a "classic christmas movie"[sic]
As you can see, he really got into character.
esiegel | December 10, 2012"My role in society, or any artist's or poet's role, is to try and express what we all feel. Not to tell people how to feel. Not as a preacher, not as a leader, but as a reflection of us all." -John Lennon
Welcome to the latest edition of Messier Monday, where each week we take an in-depth look at one of the 110 deep-sky objects in the Messier Catalog. These objects, all of which are visible from certain northern latitudes at certain times of the year, were catalogued explicitly to prevent comet-hunters from confusing these static objects with potential comets.
Image credit: SEDS Messier…
esiegel | December 6, 2012"Forget it. I didn't have that thing inside me where I wanted to smash against somebody and watch them break. I was too sensitive for that and disliked being that sensitive." -Josh Brolin
How do you figure out what something is made of? You take it apart -- cracking it open if necessary -- and look inside. This is something we've been doing since... well, since before our ancestors were even human.
Images credit: Elisabetta Visalberghi.
For most things here on Earth, that's easy enough. If you wanted to go down to the smallest scales possible, however, it becomes harder and harder to "crack…
esiegel | December 3, 2012"Who is wise? He that learns from everyone.
Who is powerful? He that governs his passions.
Who is rich? He that is content.
Who is that? Nobody." -Benjamin Franklin
Welcome to Messier Monday, where each week we take a journey into one of the 110 objects in the Messier Catalogue of non-cometary deep-sky objects. Ranging from stellar remnants to star clusters to globular clusters to distant galaxies and more, the Messier objects tell a rich and varied story that you can share in yourself through even the simplest of astronomical instruments.
Image credit: Rich Richins, of all 110 Messier…
esiegel | November 30, 2012"You don't drown by falling in the water; you drown by staying there." -Edwin Louis Cole
Our Solar System is -- at least from our perspective -- the most well-studied system of planets, moons, asteroids and comets in the entire Universe.
Image credit: Olaf Frohn, from earlier in 2012.
And in this system, the closest planet to our Sun, Mercury, was also one of the most poorly understood planets until very recently. Because Mercury is so close to the Sun, it's very difficult to view it under good conditions with a telescope; the risk of ruining your optics by exposing them to direct sunlight…
esiegel | November 28, 2012"Summer ends, and Autumn comes, and he who would have it otherwise would have high tide always and a full moon every night." -Hal Borland
Of course you know the danger that would befall us if the Earth ever got too close to the Sun, as the Perry Bible Fellowship shows, atop. But have you ever stopped to think about the Moon in our skies, and what would happen if the Earth and Moon were closer together than they actually are?
Image credit: NASA / Galileo mission.
While photos such as this -- from the Galileo spacecraft -- accurately show the relative size and illumination of the Earth and…
esiegel | November 26, 2012"The man's a born straggler... another lucky exception to the rules of natural selection. A million years ago he would've been an easy snack for a saber-toothed tiger." -Carl Hiaasen
Welcome to the latest Messier Monday, where each week we take a look at one of Charles Messier's original catalogue of 110 deep-sky objects that comet-hunters might easily confuse with those transient passers-by in our Solar System.
Image credit: Greg Scheckler, from his 2008 Messier marathon, where he nabbed 105/110.
Quite to the contrary, each of the 110 objects in the Messier catalogue are (semi-)permanent…
esiegel | November 21, 2012“We live in an atmosphere of shame. We are ashamed of everything that is real about us; ashamed of ourselves, of our relatives, of our incomes, of our accents, of our opinions, of our experience, just as we are ashamed of our naked skins.” -George Bernard Shaw
All that is real about ourselves is nothing to be ashamed about; quite to the contrary, it's something to be eminently thankful for. This very existence is all we have, and while it's minuscule compared to the entire Universe, it required the entire Universe to bring us to the point where it's possible for us to exist.
What do I mean by…
esiegel | November 19, 2012"When you look at the stars and the galaxy, you feel that you are not just from any particular piece of land, but from the solar system." -Kalpana Chawla
Welcome to this week's Messier Monday, where I pick a new object out of the original catalogue of 110 "faint fuzzies" designed to help comet-hunters avoid confusion with these fixed, extended night sky objects.
Image credit: The Messier Objects by Alistair Symon, from 2005-2009.
In previous weeks, we've focused on a variety of objects, including a globular cluster, an open star cluster, a supernova remnant and an active star-forming nebula…
esiegel | November 12, 2012"When your friends begin to flatter you on how young you look, it's a sure sign you're getting old." -Mark Twain
Welcome to yet another installment of Messier Monday, where each week, I'll pick one of the 110 Messier Objects -- deep-sky objects catalogued to avoid confusion for comet hunters -- to highlight for you.
Image(s) credit: SEDS -- http://messier.seds.org/.
So far, we've taken a look at a supernova remnant, a young open star cluster, and an active star-forming nebula, a testament to the great diversity of these faint, fuzzy objects that might be easily confused with a comet. Today…
esiegel | November 8, 2012"You have to have a canon so the next generation can come along and explode it." -Henry Louis Gates
When it comes to stars, their fates are very well known. Every single star that's massive enough to fuse hydrogen into helium in its core will someday run out of fuel and die.
Image credit: NASA, ESA, F. Paresce, R. O'Connell, & the HST WFC3 Science Oversight Committee.
The very brightest and most massive stars -- about 1-in-800 of all stars -- will die in a spectacular, core-collapse supernova when their core burns fuel all the way through iron and finally runs out of room to go.
This…
esiegel | November 7, 2012"It's a brilliant surface in that sunlight." - Neil Armstrong
Indeed, all that glitters so brilliantly in the cosmos does so because of the stars that have formed throughout it.
Image credit: NASA, ESA, and the Hubble SM4 ERO Team.
Over the 14 billion-or-so years that our Universe has been around, we've formed hundreds of billions of stars in our galaxy alone.
Image credit: ESO / Serge Brunier (TWAN), Frederic Tapissier.
Given that our galaxy is just one of at least hundreds of billions in the observable Universe, the number of stars that have formed over our Universe's history is a…
esiegel | November 5, 2012"I hate that expression, 'fusion.' What it means to me is this movement where nothing ever really fused." -Wayne Kramer
Welcome to another Messier Monday, where each week, I pick one of the 110 Messier Objects -- deep-sky objects catalogued to avoid confusion for comet hunters -- to highlight and detail.
Image(s) credit: SEDS -- http://messier.seds.org/.
This week, I'd like to highlight one of only two star-forming nebulae visible to the naked eye in the night sky, and I want to do it before it disappears completely for the year! Visible for just an hour or so after sunset right now towards…
esiegel | November 2, 2012"The important point is that since the origin of life belongs in the category of at least once phenomena, time is on its side. However improbable we regard this event, or any of the steps which it involves, given enough time it will almost certainly happen at-least-once. And for life as we know it, with its capacity for growth and reproduction, once may be enough." -George Wald
That there's an amazing story of life's evolution on Earth is a scientific certainty. The evidence is encoded in the nucleic acid sequences of every living organism ever discovered, and the history of life on this…
esiegel | October 31, 2012"A cosmic mystery of immense proportions, once seemingly on the verge of solution, has deepened and left astronomers and astrophysicists more baffled than ever. The crux ... is that the vast majority of the mass of the universe seems to be missing." -William J. Broad
Despite the wondrous, luminous sights of the night sky, we've learned that normal matter -- protons, neutrons, electrons and the like -- make up only 4% of the total energy in the Universe.
Image credit: Large Suite of Dark Matter Simulations (LasDamas) simulation; Vanderbilt.
The galaxies and clusters of galaxies lighting up…
esiegel | October 29, 2012"Something there is more immortal even than the stars,
(Many the burials, many the days and nights, passing away,)
Something that shall endure longer even than lustrous Jupiter,
Longer than sun or any revolving satellite,
Or the radiant sisters the Pleiades." -Walt Whitman
Last week, we kicked off our very first Messier Monday by spotlighting M1: the Crab Nebula. But with 110 different objects to choose from, the Messier catalogue represents some of the brightest and most universally accessible wonders of the night sky.
Image(s) credit: SEDS -- http://messier.seds.org/.
Many of these…
esiegel | October 24, 2012"The sun is a mass of incandescent gas
A gigantic nuclear furnace
Where hydrogen is built into helium
At a temperature of millions of degrees" -They Might Be Giants
It's so ingrained in us that the Sun is a nuclear furnace powered by hydrogen atoms fusing into heavier elements that it's difficult to remember that, just 100 years ago, we didn't even know what the Sun was made out of!
Image credit: Landscape Photography by Barney Delaney.
The conventional wisdom at the time, believe it or not, was that the Sun was made out of pretty much the same elements that the Earth is! Although that…
esiegel | October 22, 2012"This nebula had such a resemblance to a comet in its form and brightness that I endeavored to find others, so that astronomers would not confuse these same nebulae with comets just beginning to shine." -Charles Messier
Let's take a journey back in time to when our known Universe was a lot smaller. The only planets discovered were Mercury through Saturn: the naked eye planets. The well-known objects were our Moon, the (naked-eye) planets and their moons, and the stars and the Sun. After those, the only new objects that were routinely hunted in the night sky were those two-tailed recurring…