I suspect it seems rather random, but at least what I think is happening is that it's a combination of summed-up gravitational attractive forces from nearby galaxies plus left-over momentum from the Big Bang... after all, in a vacuum, except for collisions, there's nothing which dampens motion.
Tidal interactions with neighboring galaxies and momentum from the ever-expanding universe (aka dark energy), however local groups of galaxies "defeat" the expansion with the sum of gravities of all the galaxies within that region. This is why you have net-like clusters and superclusters of galaxies. Usually you see galaxies with tons of neighbors, and there are few isolated galaxies. I think the general consensus is that the isolated ones have collided and reformed in shape, but that takes quite a bit of time.
2 pages too late but related, when I was a kid, I think as many here, I used to play video games. And sometimes mom would bring tea while we were playing. There is this one game that... if I play it, or even remember it, brings back the taste of a certain pie I haven't had for years and years.Interesting, because I've always had the theory that everyone had a little bit of synaesthesia in them. For example, I always associate the number 3 with green. The brain works by association, so it would make logical sense that synaesthesics are perhaps more sensitive to these associations than others.
Sorry if I'm stating the obvious, I'm not an expert in anything. I do however have a passing interest in science and sciency stuff like this.
The cloth (EG, if you try this with a blanket) decelerates the orange. Not so in space.We're all familiar that gravity according to Einstein and supported by many is a distortion of space... And they always give that example of the bowling ball being the sun and the orange is the earth, then place them in a deformable surface to simulate "space". Then they show how pushing the orange, it circles around the sun. That's all fine but sooner or later it'd spiral down and crash against the sun... How many pages does it take to explain why this doesn't happen?
What about by peeing? xDThe cloth (EG, if you try this with a blanket) decelerates the orange. Not so in space.
I like to keep perspective when i think about physics in space by remembering that, if I were floating in space with no gravity acting on me, I could accelerate to the speed of light just by holding a running garden hose. It would take billions of years, but if I had enough water I'd get there.
So what will happen first... sun explodes into giant red or Neptune spears off into the unknown?The planets orbits degrade over time away from the sun since the sun is constantly losing mass and that shifts the barycenter (center of mass) of the solar system outward.
This:Our sun wont explode, and the former is the answer to your question.
Earth's fate is precarious. As a red giant, the Sun will have a maximum radius beyond the Earth's current orbit, 1 AU (1.5?1011 m), 250 times the present radius of the Sun. However, by the time it is an asymptotic giant branch star, the Sun will have lost roughly 30% of its present mass due to a stellar wind, so the orbits of the planets will move outward. If it were only for this, Earth would probably be spared, but new research suggests that Earth will be swallowed by the Sun owing to tidal interactions. Even if Earth would escape incineration in the Sun, still all its water will be boiled away and most of its atmosphere would escape into space. Even during its current life in the main sequence, the Sun is gradually becoming more luminous (about 10% every 1 billion years), and its surface temperature is slowly rising. The Sun used to be fainter in the past, which is possibly the reason life on Earth has only existed for about 1 billion years on land. The increase in solar temperatures is such that already in about a billion years, the surface of the Earth will become too hot for liquid water to exist, ending all terrestrial life.
Nope, the red giant phase would have gulped us all up, while the main giant planets would be much further away by the time it evolves into a white dwarf.Yeah I know main sequence stars dont supernova, that doesnt mean they dont explode at the end. The "expel their gases" with great violence, that to me is an explosion
But anyway, back to the main question, will the planets orbits decay enough to escape sun's gravity before it becomes a white dwarf?
Here's a fun one.Interesting, all of this. My brain hurts a bit in this thread, though, I must admit. -_-