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bballwaterboy
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Is the distance too far and/or the trip too dangerous for inter-galactic space travel by aliens wanting to reach Earth?
Let's consider the second clause of OPie's question; what possible dangers are there in inter-galactic space - beyond boredom?bballwaterboy said:Is the distance too far and/or the trip too dangerous for inter-galactic space travel by aliens wanting to reach Earth?
I feel since we know so little of dark energy/matter there could potentially be unsuspected dangers in inter-galactic travel.Doug Huffman said:Let's consider the second clause of OPie's question; what possible dangers are there in inter-galactic space - beyond boredom?
There is so much nothing that the mean free path of a photon is 10 billion lightyears and occasionally just a few hydrogen atoms per cubic meter. There is a lot of nothing to be dangerous.
Doug Huffman said:Dark matter was found as the cause of anomalous motions of galaxies and apparently occurs in conjunction with them, as 'halos' - and not in inter-galactic space.
Weakly Interacting Massive Particles - WIMPS - are a suspected dark matter, the weakly interacting kind'a militates against their hazard.
How can you possibly image that they would "want to reach Earth"? Earth to someone in another galaxy is some utterly insignificant speck of dust WAY too far away to even THINK about having any reason to bother with and also it is just one of billions of such insignificant specks of dust far away from them.bballwaterboy said:Is the distance too far and/or the trip too dangerous for inter-galactic space travel by aliens wanting to reach Earth?
Exactly, this with a lot of other factors would add to the danger involved with inter-galactic travel.SteamKing said:Even if interstellar travel existed, it would probably be easier to find one particular grain of sand in the Sahara Desert than to locate the Earth from inside the Milky Way galaxy, let alone from outside the galaxy.
It's not like there are a bunch of Burma Shave signs in outer space pointing the way here. Even if alien civilizations were listening for radio transmissions, these could only be picked up from within 125 light years of earth, which is well within the Milky Way.
Has it ever crossed your mind that you arguing against reality doesn't change it?iknowsigularity said:i would argue that more of "empty space" is fill with low levels of dark matter rather than empty void.
Its a physics forum, not youtube comments. Try replying with something of content.Danger said:Has it ever crossed your mind that you arguing against reality doesn't change it?
We have done nothing but reply with content. You are the one who came here uninvited and is unwilling to accept input from people who clearly know far more about the subject than you do.iknowsigularity said:Its a physics forum, not youtube comments. Try replying with something of content.
ok fair enough, my apologies.Danger said:We have done nothing but reply with content. You are the one who came here uninvited and is unwilling to accept input from people who clearly know far more about the subject than you do.
You are certainly not being of any help to the OP.
bballwaterboy said:Is the distance too far and/or the trip too dangerous for inter-galactic space travel by aliens wanting to reach Earth?
This is blather and does not belong in a serious discussion. If you were trying to be funny, I didn't get it.tionis said:They evolved and now travel through the bulk. Just like we are going to evolve into bulk beings. I saw it in a movie recently.
phinds said:This is blather and does not belong in a serious discussion. If you were trying to be funny, I didn't get it.
phinds said:How can you possibly image that they would "want to reach Earth"? Earth to someone in another galaxy is some utterly insignificant speck of dust WAY too far away to even THINK about having any reason to bother with and also it is just one of billions of such insignificant specks of dust far away from them.
I don't follow you at all. My response was completely serious.tionis said:Judging by your previous reply to the OP, you could have fooled me that you actually took the the discussion as ''serious.'' :p
phinds said:I don't follow you at all. My response was completely serious.
? You have a scientist to back up the statement "They evolved and now travel through the bulk. Just like we are going to evolve into bulk beings. I saw it in a movie recently."tionis said:So was mine. And I have a caltech scientist and a billion lines of code that back me up.
Do you have any idea of what the word "Physics" in "Physics Forums" means? Sure, this is a particular small section that deals with SF and even sci-fi and fantasy, but you can't expect anyone who lives here to totally overlook the laws of nature and science that have already been established. In case you were unaware of it... think of every single grain of sand that exists on Earth, in deserts, on the ocean floor, in your cat's bathroom, wherever. That number does not even come close to how many stars there are in the observable universe. Do you ever look up in the sky, pick out a spot that has no visible star because the one in that direction is too far away to be seen, and think, "Gee, I'd really like to go there"?tionis said:Judging by your previous reply to the OP, you could have fooled me that you actually took the the discussion as ''serious.'' :p
No, our current technology is not advanced enough to travel to other galaxies even if aliens did exist. The distance between galaxies is incredibly vast and our current spacecrafts are not equipped to handle such long distances.
To travel to other galaxies, we would need much faster and more efficient spacecrafts that are able to sustain life for long periods of time. We would also need advanced propulsion systems and navigation technology.
It is possible for aliens to travel to our galaxy if they have advanced technology and are able to overcome the challenges of inter-galactic travel. However, we have no evidence or proof that aliens exist or have the capability to travel to other galaxies.
The time it takes to travel to another galaxy would depend on the speed of the spacecraft and the distance between the two galaxies. With our current technology, it would take hundreds of thousands of years to travel to the nearest galaxy.
There are various theories and concepts such as wormholes, warp drive, and antimatter propulsion that have been proposed as possible ways to travel to other galaxies. However, these are still theoretical and would require significant advancements in technology to become a reality.