Abiogenesis wrote:I doubt anyone can predict supernovae down to a year, there are multiple stars predicted to go supernova extremely soon - however extremely soon is anywhere within the next 1,000,000 years. Eta Carinae is a major candidate and seeing as it is a huge star it will produce a huge super or even hypernova and its only 8000 light years away.
Considering this is a big star, it's barely thought to be of any threat to Earth. Supernovae are hugely powerful events, however they are generally quite far away when they happen, all radiation obeys the inverse square law and the distance is dazzlingly huge. The only way in which we would be anywhere near at risk would be if some of the concentrated gamma ray bursts that are emitted as it forms a black hole are aligned to hit the Earth, even then they wouldn't be particularly devastating. Extremely close, extremely powerful supernovae have been thought to lead to one extinction event in the Earths past however it was a relatively small extinction event, something like a Methane-Clathrate disaster is far more dangerous.
Additionally although Supernovae are bright there is simply no way they are going to outshine the sun, lets say Eta Carinae blew up today, it would be visible during the day and probably as bright as a full moon at night - if not a little brighter. However it certainly wouldn't be as bright as the Sun and it wouldn't last very long at all, that's the point behind supernovae, they are extremely energetic events and as a result extremely short lived - over in a few seconds. The light we see is mainly from surrounding gas getting excited by the higher energy photons created in the explosion.
Anyway the whole 2012 thing is total bull, the only reason the calendar ends in 2012 is because there are no Mayans left to extend it, if they were still around they'd just create a new calendar. This whole scare is like people rioting when the calendar in their kitchen runs out of days, because obviously if your calendar stops then time stops too ಠ_ಠ
Supernovae are powerful events, and the sun you speak of can or cannot be incredibly dangerous to earth. There isn't really any reliable method to test a suns density from such a vast distance. If that sun were 10 times as dense as our sun(just a random figure) and it exploded into a supernovae, the blast of radiation would be preposterously endangering to our planet. A hyper novae is an even worse scenario.
It's very true that the sun cannot be outshined by anything near us. For years to come (in terms of hundreds of millions) the sun WILL be the dominant entity of our sky.
Also, there are many Mayans still alive today. Mayans never died out, I don't know where an idea like that would come from. Watch the news, and you'll hear stories about how the modern Mayans THEMSELVES are saying 2012 won't happen. And I don't mean Mayans is the idea of people that adopted the Mayan culture; I mean Mayans that actually are descendants of the ancient Mayans.
Well, I think SOMETHING is going to happen in 2012.
There's a lot of weird star stuff going on on December 21st, 2012--the sun going into the center of the Milky Way and all. That's probably going to screw up our gravity. I don't necessarily think that the world will explode, but I think at least something small is going to happen.
I'm still going to tell everybody I care for that I love them on December 20th, 2012 though. Just in case.
We are LIGHTYEARS away from the center of the galaxy. Even if we went at the speed of light, our sun couldn't get to the center for 28,000 years. And as everything natural moves in a vacuum (therefore, theoretically, cannot go faster than light), there is no hope of us getting to the center of our galaxy. Even if by some magical act of nature, we teleported there, there is no proof that anything at all is there. The common theory that is widely distributed is that there is a black hole there. What the media and any other source always fail to leave out is that the validity of that theory is only around 0.6 percent. That's how sure we are that there is a black hole at the center of our galaxy.
FowlStar wrote: (...) I think the world might explode in five billion years....when our sun explodes... (...)
Umm... To be honest, Sun will first become a red giant and eat Mercury (U know. The planet which is closest to the Sun) and Venus (the closest planet after Mercury) and than will Earth become too hot and Titan (Saturn's satellite) will become warm enough for life, and than Sun will explode and become a white dwarf and shine until it spends all it's energy and become cold as the rest of the Universe (about -211°C)
Thank you for listening my convection.
(God, I really am smart...)
(thx for correcting my spelling, Teo)
Our sun won't explode in 5 billion years, it will merely deplete it's energy, and IMPLODE on itself. Our sun is too small to actually turn into a black hole, so it will turn supernovae, engulf every planet up until mars (including Earth. However, water will have evaporated YEARS before this happens.) and then shrink down into a white dwarf start. Titan (Saturn's planet-like moon) will likely have artificially been warmed up enough to hospitable levels before anything like this happens. The process of terraforming is our form of interstellar colonization. Terraforming is basically changing the landscape of our planet to meet the requirements for life. This includes releasing large amount of greenhouse gases into the atmosphere to warm it up, and then planting trees and such to allow oxygen to spread. The process takes a century at least, however. I believe that within the next 1,000 years, Titan, amongst other planets such as Venus and Mars, will have been terraformed.
So, back to my original point. When the sun DOES expand, human activity will have Titan succumb to the same dread Earth went through, and any liquid at all will be evaporated.
Kitty wrote:^Umm... If I may notice, in the centre of out galaxy is a really BIG black hole. I mean, all black holes are big, but this one is BIG. And whole galaxy is turning around that BIG black hole, just like our planets around the Sun, and our planets don't fall in the Sun just like that, they need MUCH energy to take them off their current orbit (spelling). So, there's NO way that something can move the Sun to that BIG black hole.
1) Sun is big. and heavy
2) I don't even want to think how much energy will you spend if you try to move the Sun
3) everything what comes too close to it, Sun melts and eats.)
Basically what you said here. The Earth alone weighs 4.6 quintillion tons, and the Sun ways over a MILLION times more. We couldn't even dream of altering the suns gravitational path with current technology, and still couldn't dream about it in 1,000 years.
Edit: I re-read that. We don't know that their is a black hole at the center of our galaxy. It's a theory, and one that isn't always properly conveyed by the media, etc. The theory is only about 0.65 determined. That's how much of a chance that there is a black hole at the center of our galaxy.
And when it comes to black holes, size is a relatively small variable. A black hole the size of the earth could be just as powerful as one as big as one as big as 1,000,000 suns.
Fun fact of the day: The sun gives off more energy in one second, than people have used from the beginning of time.