As Douglas Adams pointed out so eloquently, our universe is big. Really big.
It's so big, in fact, that it takes light billions of years to travel across it - and light travels very fast (at a whopping 186,000 miles per second).
So it's an almost unthinkable task for scientists to probe questions like:
And yet, there are clever wizards (as I like to call them) who have made it their job to figure it all out. Not just theoretically - but to actually find evidence to prove their ideas about the nature of the universe and the fabric of space-time itself.
This article highlights some of the amazing advances in cosmology, and may also inspire some explorative lucid dreams about our universe. By the way, I'm not an astrophysicist so if I mash up some of the facts a bit, please don't beat me over the head with a stick.
Ever since we began pointing large optical telescopes at the sky, we have been precisely mapping out the stars and galaxies within our little bubble of the universe.
This "bubble" exists because at some point, we reach a wall. This isn't due to the limitations on our telescopes, but rather the speed of light. In essence, everything that exists beyond this wall is so far away, that even the light has not reached us yet.
Instead of seeing more galaxies and more space, we see the Cosmic Microwave Background Radiation (CMBR) - a wall of radiation created by the Big Bang, which occurred some 12-14 billion years ago. This stuff is everywhere - you can even see it when you get the snowstorm picture on your TV. But in terms of mapping outer space, it's all we can see when we look out at the very edge of the known universe.
Imagine you're on a boat in the middle of the ocean. Your view, no matter how powerful your telescope, is always limited to the horizon (the radiation wall) because of the curvature of the Earth. Only by sailing to a different place in the ocean could you extend your view beyond the previous horizon...
And this neat little metaphor brings us to another burning question: what shape is the universe? Is it flat - or curved like planet Earth?
A flat universe would be infinite. If you left Earth in a rocket ship and flew off in a straight line, you would keep on going, forever. And ever. And ever.
However, a curved universe would be finite. Your straight-line rocket ship flight would (eventually) bring you right back to where you started. As if somehow the universe looped back on itself or was curved like a sphere.
To find out which theory was true, cosmologist Dr Brian Boyle used cutting-edge technology to create a 3D map of the universe. Then he studied the galaxies and their interactions with each other to estimate the weight of all the galaxies on the map.
Amazingly, Boyle found that the universe is much lighter than anybody had imagined. Too light, in fact, for there to be enough gravity to pull it into a curved shape. He concluded that the universe must be flat.
This was later confirmed by a groundbreaking study of the Cosmic Microwave Background Radiation as it passes by the Earth. By monitoring the "black spots" in the radiation, scientists can see exactly what space the CMBR has traveled through to get here. It quite clearly reveals the structure of the universe to be flat.
But another, quite alarming, finding of Boyle's galaxy survey was that there is not even sufficient mass in the universe to make it flat. Barely a third, in fact. So he turned to the concept of dark energy - and proposed that the majority of the universe is made up of it.
Dark energy is invisible matter which gives the universe its structure. We know it must be there simply because of all the unexplained effects it has on space. However, we are unable to study it directly because, well, it's pretty elusive stuff, being invisible and all.
Since the Big Bang, the universe appears to have been expanding continuously. Sir Edwin Hubble taught us this in the 1920s. For a while scientists theorized that eventually we would run out of oomph - and the pull of gravity would cause the universe to collapse in on itself, the result being the Big Crunch.
That idea has now gone down the toilet. Boyle's galaxy survey suggested that not only is there insufficient gravity to cause a Big Crunch, but that 4 billion years ago, around the time when planet Earth was in its embryonic stages of development, the expansion of the universe actually started accelerating.
What caused our expansion to step up a gear? Paul Davies, author of How to Build a Time Machine, says the explanation could lie in anti-gravity. This is dark energy, locked in a never-ending war with the force of gravity, pushing the galaxies further apart.
So while the center of each galaxy is thought to contain a large black hole with immense gravitational forces pulling all the stars in around it, the space between each galaxy is much different. It is filled with dark energy, pushing the universe apart. And in trillions of years time, Davies says, the universe will be a very lonely place to be.
Now that we know the universe is infinite, and expanding at a rate we could never catch up with, we will probably never know what's at the edge of the universe.
What we can say, theoretically, is that the Big Bang happened once, and so it could happen again. Not necessarily here in our universe but in other universes beyond our own, each with their own space and time. And where does that leave you?
Why, the multiverse of course...
The fact that there could exist an infinite number of other universes means that, ultimately, every possible outcome of every possible beginning could be played out. And so there could be an infinite number of you and me residing within them.
This leads us to the bizarre conclusion that you have died an infinite number of times before. You have lived as an Emperor. You have traveled to the moon. You have eaten bull's testicles. It's all there in Multiverse Theory.
And while some universes would be virtually identical to ours, others would be unrecognizable - containing space, time and bizarre forms of exotic matter.
"Your idea is crazy," Niels Bohr once said. "But is it crazy enough to be true?"
Here's one scientist who definitely thinks so. His name is Rob Bryanton and while he sometimes sounds like a complete nutcase, his probing ideas give us some fascinating food for thought. In the following video, Bryanton explains how to imagine the 10th dimension, drawing on Multiverse Theory. I'll leave you on this note =)
You're not giving up there are you? Here is Part Two...
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If you saw the Christmas edition of Charlie Brooker's awesome Black Mirror [spoiler alert] you would have watched Jon Hamm mentally and emotionally torture an innocent woman living inside an egg. Ok, back up a bit. She wasn't really a woman. She just thought she was. One week earlier, Hamm's technical team implanted a 'cookie' into a real woman's eyeball. The cookie was an artifically intelligent computer chip. And over the next seven days it learned the personal preferences, thoughts and emotions of its female host. It even took on her life's memories.
Dream herbs are used to induce lucid dreaming, which, most accurately is described as an awareness that you are dreaming to the point that you can control dreams. But, on a more basic level, dream herbs also seem to be linked to increased dream recall or simply an awareness that you are dreaming even if you cannot control the dream. Today I'm going to summarize the best dream herbs for lucidity - as well as where to buy the seeds, how to grow and cultivate them, and what effects that have on your dreams.
My dream life is pretty intense. It always has been. And over the years I've categorized my dreams into five broad types. Here's how to identify the nature of your dreams and how you can turn any of them into lucid dreams. Studies reveal that the average person daydreams for a whopping 70-120 minutes of their waking day. Daydreaming is an important part of dream research. As with all types of dreams, you enter a kind of hypnotic trance and allow your unconscious thoughts to rise to the surface.
I'm half-asleep in bed, aware of fleeting dream images behind my closed eyelids. I start saying "I'm dreaming" in my head and shape the hypnagogia into a view across a lake. I place every detail in my mind's eye: the stillness of the water, the distant trees on the horizon, the twilight of the sky. I imagine my whole body in this space and it soon "pops" into existence and becomes a lucid dream. I cement my lucidity and breathe in the night air. It is beautiful. I must be somewhere in Scandinavia and this gives me the idea to summon the auroras.
Does this face look familiar? It should. This is the result of image averaging - a technique in which multiple headshots are averaged out into a single face. In this case, our composite guy was generated by psychology student and photography enthusiast, Bill Lytton. Lytton averaged out 32 attractive male celebrity faces. To avoid personal bias, he referred to Maxim's Hot 100 and other opinion polls. He also averaged out a bunch of unattractive male faces for comparison.
Experts agree that everyone is capable of having lucid dreams. Dreaming itself is a normal function of the mind. We all dream every night, even if we don't remember. And we all achieve conscious awareness while awake every single day. So what does it mean to combine these states? Why, the amazing ability to have conscious - or lucid - dreams. Sounds simple, doesn't it? So why do I keep hearing from people who say they can't achieve their first lucid dream?