The immensity of the universe and what it means for Planet Earth.
Jean and I have been watching the astounding BBC Series Wonders of Life presented by Professor Brian Cox. Here’s the BBC trailer:
and there are more clips from the programmes on the relevant part of the BBC website. There is so much about the series that is breath-taking. So much that reminds one of what a beautiful and fragile planet we live on. Quite rightly, the series received great reviews. Here, for example, is a little of what the UK Daily Telegraph newspaper wrote:
Wonders of Life, BBC Two, review
Sarah Crompton reviews the first episode of Brian Cox’s latest series, Wonders of Life (BBC Two).
When it comes to presenting styles, Professor Brian Cox is hard to keep still. There isn’t a beach he won’t feel compelled to stroll on, a mountain he won’t climb, or a river he won’t jump into. And what does he carry in that bag?
Once you got beyond these irritating stylistic tropes, however, Wonders of Life (BBC Two) was Cox at his absolute best, using his natural enthusiasm to communicate complicated ideas in very simple ways. He decided, for example, to show us his own DNA by spitting in a test tube – and missed.
“A physicist doing an experiment,” he giggled, with unforced charm. But when he actually succeeded, those little strands of white that you suddenly see brought everything he subsequently said to life.
He was brilliant at explaining his thesis, which was actually about the second law of thermodynamics, so not that much of a doddle to grasp. If I’ve got it right, what Cox thinks is that life itself may have been the inevitable consequence of the laws of physics and can be explained in the same terms as we explain “the falling of the rain and the shining of the stars”.
Sarah rounds off her review, thus:
The programme’s sophisticated use of graphics, and Cox’s patient repetition of his conclusions, all added to the sensation that this is a series that is actually going to tell you something. For the BBC to unveil both this and The Story of Music over a single weekend reveals a pretty impressive commitment to public service broadcasting. Long may it last.
One of the clear messages that comes from the program is the fact that our universe and the formation of life are intimately connected. That the ‘big bang’ some 3.2 billion years ago, the huge interstellar gas clouds, the formation of the carbon atom and the subsequent long-chained molecules, the collapse of those gas clouds to form suns and planets, the start of life, evolution through natural selection to ever more complex life forms, and on and on and on were and are inevitable. The science is clear. There is nothing mystical about it.
Yes, of course, anyone with half-an-ounce of sensitivity will be in awe of it all; the power and beauty of nature and of the natural world.
But here’s the rub.
As another BBC television programme explained, the universe is bigger than beyond imagination. That was from the BBC Horizon broadcast of August, 2012: How Big is the Universe? Here’s the trailer for that programme.
Stay with me a little longer! Just look at the following image.
The Andromeda galaxy.
This image of the Andromeda galaxy, taken in infrared and X-ray, consists of over a trillion stars.
The detailed Spitzer Space Telescope view above features infrared light from dust (red) and old stars (blue) in Andromeda, a massive spiral galaxy a mere 2.5 million light-years away. In fact, with over twice the diameter of our own Milky Way, Andromeda is the largest nearby galaxy. Andromeda’s population of bright young stars define its sweeping spiral arms in visible light images, but here the infrared view clearly follows the lumpy dust lanes heated by the young stars as they wind even closer to the galaxy’s core. Constructed to explore Andromeda’s infrared brightness and stellar populations, the full mosaic image is composed of about 3,000 individual frames. Two smaller companion galaxies, NGC 205 (below) and M32 (above) are also included in the combined fields. The data confirm that Andromeda (aka M31) houses around 1 trillion stars, compared to 4 hundred billion for the Milky Way.
Please stay with me for a few more minutes. Keeping the Andromeda galaxy in mind, now read this:
ESA astronomers say that for every ten far galaxies observed, a hundred go undetected.
Astronomers estimate that there are between 100 billion and 200 billion galaxies in the known universe. A single galaxy such as the Milky Way contain upwards of 200 billion normal stars. About 75 percent of all stars in the Milky Way are less than half as massive as our Sun. In the universe at large, the majority of galaxies are classified as dwarfs, each with less than a few hundred million stars. The image above is a computer simulation of a colliding dwarf galaxy triggering the formation of the Milky Ways spiral arms.
The largest project ever undertaken to map out the Universe in three dimensions using ESO telescopes has reached the halfway stage. An international team of astronomers has used the VIMOS instrument on the ESO Very Large Telescope to measure the distances to 55,000 galaxies as part of the VIPERS survey (VIMOS Public Extragalactic Redshift Survey). This has already allowed them to create a remarkable three-dimensional view of how galaxies were distributed in space in the younger Universe.This reveals the complex web of the large-scale structure of the Universe in great detail. The light of each galaxy is spread out into its component colours within VIMOS. Follow up analysis then allows astronomers to work out how fast the galaxy appears to move away from us — its redshift. This in turn reveals its distance and, when combined with its position on the sky, its location in the Universe.
Wow!
Millions of galaxies, trillions of suns, inconceivable numbers of planets.
Please pause and let the numbers sink in.
Now back to that Wonders of Life BBC series, during which Professor Brian Cox, said, “that it is inconceivable that there isn’t life elsewhere, that life is not present on countless other planets circling countless other suns …“.
In other words, if mankind is so intent on ‘fouling our nest’ on this most beautiful of planets, so what!
In the bigger scheme of things, it matters not. Find that tough? Then go and hug a dog and enjoy the moment. For tomorrow may never come.
Dan sent me an email with a link to a most astounding video. But before we get to that, just take a look at these images. Here are the first three from the set of eight.
Eight breathtaking images of baby stars
1. Beautiful newborns
In a universe of fantastic images, a newborn star is a mystical masterpiece. Cradled within the dusty arms of a nebula, a baby star seems to blink its way to a new life. The lifespan of a star is a series of sequences. A star may spend most of its life in a “main sequence phase” where nuclear fusion of hydrogen into helium is happening in its core. But before this happens, it lives as a protostar, or baby star.
Thanks to NASA’s advanced infrared space telescopes such as Hubble and Spitzer, we are able to view these star births as never before. Pictured here are newborn stars peeking out “from beneath their natal blanket of dust” in the Rho Ophiuchi dark cloud as seen by the Spitzer Space Telescope. (Text: Katherine Butler)
2. Young stars in Serpens
Here the Spitzer Space Telescope reveals the Serpens South star cluster, in which 50 or so young stars exist. They are seen as the “green, yellow, and orange-tinted specks sitting atop the black dust lane.” A supernova or galaxy collision can cause a star to form when huge clouds of hydrogen and helium collapse under mutual gravity. As the cloud collapses, it heats up and starts to spin. Since protostars are covered in dust, they can be seen only through infrared telescopes like Hubble and Spitzer. As Universe Today writes, “After about 100,000 years or so, the protostar stops growing and the disk of material surrounding it is destroyed by radiation.” Then this star, now called a T Tauri or pre-main sequence star, is visible from Earth.
3. Bubbly little star
We are used to images of babies blowing bubbles, and it looks like the infants of the cosmos do the same. This image, taken by the Spitzer Space Telescope, shows the HH 46/47 baby star blowing bubbles into space via powerful jets of gas. Located about 1,140 light-years from Earth, HH 46/47 is the bright white star at the middle of the image. Two bubbles reach out in opposite directions and are formed when the jets collide with the dust and gas surrounding the star. As Universe Today reports, “Astronomers think that young stars accumulate material by gravitationally pulling in gas and dust. This process ends when the star gets large enough to create these jets. Any further material is just blown away into space.”
Go and view the remaining five stunning images here.
Now to what was sent by Dan.
Check out this mind-bending video that talks about the “Hubble Ultra Deep Field” image captured by NASA astronomers nearly a decade ago — a photograph that some call “the most important image ever taken.”
It all started back in 1996 when a group of astronomers pointed the Hubble Space Telescope at an empty patch in the sky close to the Big Dipper in hopes of seeing something, anything. At the time, it was considered to be a risky move, given that demand for use of the telescope was so high. What if the experiment yielded no results? What if nothing but an empty image was the final result?
After ten full days of exposing the telescope’s CCD camera sensor to this seemingly vacuous patch of sky, a breathtaking image was produced. Over three thousand galaxies appeared in one image — some as dots, others as spirals. It was a visual reminder of just how big our universe really is. The photo is called the “Hubble Deep Field“:
In 2004, astronomers pointed Hubble near constellation Orion and opened the shutter for a whopping 11 days. Using sensitive detectors and specialized filters, the telescope was able to capture an image with over 10,000 galaxies. This image became known as the “Hubble Ultra Deep Field.”
Scientists later used redshift calculations of the galaxies to turn the photograph into a “fly-thru” view of the photo:
It didn’t end there. Last year, NASA scientists created the Hubble Extreme Deep Field, which has an equivalent exposure time to 23 days and features. It’s the “deepest image of the sky ever obtained” that reveals “the faintest and most distant galaxies ever seen”:
And just think: scientists created these photos by pointing their mega-camera at a tiny speck of the night sky that appears to be completely devoid of visible stars!
oooOOOooo
“… a tiny speck of the night sky that appears to be completely devoid of visible stars!”
Dan said in his email, “Are we really here? What are the chances?”
You really have to wonder! Incredibly long odds. Both to us being here and to us being the only conscious, intelligent species in the universe.
There is so much information around us these days that it’s easy to forget how incredibly advantaged are those today that wish to learn about everything and anything. It was just such a meander around the internet that brought me to a website called Science Daily, a wonderful daily digest of top science news items.
And a browse through that web site brought me to this piece on the creation of the very first stars in the universe.
June 1, 2007 — Astronomers removed light from closer and better known galaxies and stars from pictures taken with the Spitzer Space Telescope. The remaining images are believed to be the first objects in space, 13 billion light years away.
The first stars in our universe are long gone, but their light still shines, giving us a peek at what the universe looked like in its early years.
Astrophysicists believe they’ve spotted a faint glow from stars born at the beginning of time. Harvey Moseley, Ph.D., an astrophysicist at the NASA Goddard Space Flight Center in Greenbelt, Maryland, says, “The reason they’re faint is just because they’re very, very far away, they’re over at the far edge of the universe.”
I don’t know about you but I find this so deeply inspiring – a reminder of the instinctive nature of man to enquire and explore. And it is this exploratory instinct that will pull us all through from the challenges that we all face today.
Anyway, I’m wandering off the subject!
Do read the piece in full here and then watch the following video from Avi Loeb.
Oh, want to know how far 13 billion light years is? Brace yourself!
Light travels at 186,000 miles per second or more properly expressed 299,792.458 km/sec. See here. (Brilliant website by the way) That is 10 trillion kilometres a year.
So 13 billion light years is simply! 10 trillion multiplied by 13 billion kilometres. Anyone got a larger calculator?
Learning from Dogs 