schot
Very interesting thread man. I think if anything, the galactic alignment is what I'm worried (excited) about. You would probably be better at finding all the required info, but here's what I've gathered (from memory) from several places.
Every 11 years, we have sunspots. This is most likely caused by the gravitational pull of the sun being weakened by having 2 planets, Jupiter and Saturn i think, on opposite sides of the sun. The last one was in 2001. We are spinning around our sun, which in turn is spinning around the center of our galaxy which is believed to be a "black hole" with unimaginable gravitational pull. We're out near the edge, and right now, we're on the top (bottom? who knows
razz ) edge of the spiral. In '12 we're going to be passing through and down to the bottom edge, crossing directly across the center of the galaxy, having our sun aligned with it. Now, this happens either 11,000 or 26,000 years (cant quite remember). So on the same time that our sun's g is weakened, we'll be open towards the center of the galaxy. They believe (and have proven the alignment...i'm pretty sure it was from the nasa site) that the last time this happened, Mars was in the position we're going to be in. So,
galaxy center
|
mars
|
jup- sun -saturn
|
earth
is basically what it was lined up as. They believe that mars used to have an atmosphere much like earth, but this event, the weakening of the sun's pull, and mars being completely open to the center of the galaxy, sucked the atmosphere right off the planet. I dunno how long the oort cloud has been there, but that's about the only strange thing I see about it. Anyways, this time around it's going to be the same alignment, except earth and mars will be in opposite positions. Of all the theories I've seen, this one seems to have the most (if still small amount) of proof to back it up. The mayans were into stars and astronomy, so maybe they could have predicted it too. What do you think?
well first off, Sun Spots happen every year
razz They're a natural part of the Suns life, just like solar flares and solar wind. You're right about the 11 years the Sun's magnetic field flips, causing a massive cycle of suns spots to occure, but it really doesn't have to do with Jupiter or Saturn. It's caused by a natural imbalance thanks to the Sun's constant nuclear activity.
True, the first two of the Gaints are large in size and comparison to the Earth, but the Sun's size pales in comparison even with the masses of Jupiter and Saturn put together. The Sun has a mass of 1.9891×1030 kg, and a volume of 1.412×1027 m3. 1,300,000 times bigger then Earth's own volume.
You can fit 926 Jupiters into the Sun's Volume, and 1,481 Saturns.
In comparison to Gravity though it's the same thing. The Sun is so massive that it's able to keep the planets in linear orbit. The planets themselves too effect the sun, because of a common share of Gravitational pull, but the Planet's to the Sun's ratio is so minuscule that you wouldn't be able to notice.
In proportion, it's like saying you have two elephants on opposite sides of the world, would jump at the exact same time to try to off set the Earth's Orbit. It can't happen. They're just too small.
Not only that, but you have to calculate Jupiter's and Saturn's distances away from the Sun.
Jupiter has an average orbit of 483,780,000 miles away from the Sun. Saturn's is 941,070,000. As big as they are compared to Earth, and as strong as a gravitational pull they probably have on their own surfaces, they're so far away and smaller than the Sun that it wouldn't effect it.
As far as Mars goes though, Mars has an extremely thin atmosphere. Carbon dioxide takes up 95% of this, along with Nitrogen, Argon, Oxygen etc in amounts that aren't even above a 1%.
The only clue that Mar's had an atmosphere like Earth's, or even a trace of life was a small sample of Methane Gas in the the atmosphere. (Methane is released when Carbon, found in all living things, rots due to chemical change)
If Mar's had a atmosphere similar to Earth's though, and it had been sucked off the face of the planet, it wouldn't have been due to gravity alone. Space itself is empty, and you would need a massive (!) force much closer to Mars then the distance between it and the center of the Milky Way to cause a vacuum to strip so much gas off a face of a planet.
It all really comes down to distance and perspective. Sure the black hole is large enough to govern the Sun and have you Solar System locked in orbit, but we're inside one of the Outer Bands of the Milky Way. The Black hole, even if you combined it with the Sun's gravitational pull, isn't close enough to effect us more then it has by keeping us in it's orbit.
And again, we're not really going to align with the Supermassive black hole. It's all in a matter of Earth's perspective. *scratches head* i'm probably going to have to edit the Mayans and tag on a few pics to explain the whole perspective of a Galactic alignment though. I've been meaning to make a diagram of it, but i've been really busy with work.