Timeline for I want my aliens to arrive at the edges of the solar system. They would arrive in a week. What do I need to have?
Current License: CC BY-SA 4.0
19 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Sep 18, 2020 at 9:45 | review | Suggested edits | |||
| Sep 18, 2020 at 14:31 | |||||
| Sep 17, 2020 at 23:55 | comment | added | Mindwin Remember Monica | @J... fixed. thanks. That's why I added the Death Star comparison. The alien mothership can be smaller than the DS and still create the necessary gravitational disturbance to be detected by LIGO. | |
| Sep 17, 2020 at 23:54 | history | edited | Mindwin Remember Monica | CC BY-SA 4.0 |
added 23 characters in body
|
| Sep 14, 2020 at 19:18 | comment | added | J... | @Mindwin A supertanker is nearly E+9kg, but note that E+17 is eight orders larger than that (ie: 100 million times, not one million times). | |
| Sep 14, 2020 at 19:00 | history | edited | Mindwin Remember Monica | CC BY-SA 4.0 |
added 248 characters in body
|
| Sep 14, 2020 at 19:00 | comment | added | Mindwin Remember Monica | @J... Fixed it. An supertanker is 10e+9 Kg in mass. However, the 10e+17 mass required for the alien fleet is still smaller than a Death Star's mass, somewhere between 10e+18 e 10e+22 as estimated in the link. | |
| Sep 10, 2020 at 18:06 | comment | added | jamesqf | Re "thousands of light-years away", change that to millions of light-years. AFAIK, there hasn't yet been a detection from a source within our galaxy. | |
| Sep 9, 2020 at 11:09 | comment | added | David Z | @mlk I was talking about a signal produced by the ships coming out of warp, which would appear as a transient point source. That would take quite a while to confirm as something artificial. If the ships are continuously radiating as they approach, then yes it will be much quicker to confirm that, but that's a much less realistic scenario. | |
| Sep 9, 2020 at 7:38 | comment | added | mlk | @DavidZ As far as I understand the procedure, as long as they can pinpoint direction and the signal looks at least not like an obvious error, they will not loose time and alert some optical/radio telescopes, just in case there is something happening in the direction. After all there are Nobel prizes at stake. If they then see a source which starts to blueshift more and more, i.e. is accelerating towards us and which is already close (some observed parallax between distant telescopes), aliens are a believable explanation which will be voiced. Some paranoid generals will then take it from there. | |
| Sep 8, 2020 at 21:42 | comment | added | David Z | @Topcode Sure, but those people wouldn't find out, at least not within a week. If LIGO detected a weird signal then it would be checked internally by the collaboration first, looking for problems with the detector or sources of interference. Assuming none were found, they would eventually get around to publishing the signal in a paper, but that would take months. The full data release wouldn't be for at least a year and a half according to ligo.caltech.edu/page/ligo-data. | |
| Sep 8, 2020 at 18:53 | comment | added | Topcode | @eps many more people than you think would say exactly that | |
| Sep 8, 2020 at 16:47 | comment | added | J... | @eps I don't think the idea is that it produces the exact same signature - only that it produces a gravitational signal of some kind that is detectable by LIGO above background. The idea is that it makes us take notice. A different type of signal than a black hole collision, in fact, would probably serve to make the phenomenon even more intriguing because it would be novel. | |
| Sep 8, 2020 at 16:42 | comment | added | eps | A ship coming out of FTL making the exact kind of signature that a black hole merger makes is realllly stretching believability. Even if it did, what use would it be? Nobody is going to go 'woah weird noise came from LIGO must be ALIENS'. | |
| Sep 8, 2020 at 16:36 | comment | added | J... | Tankers (all of them on earth collectively) move 2 billion tons of oil per year combined. A single tanker does not move 2 billion tons of oil - the largest move a bit over a quarter million tons in one go and are just over half a million tons fully loaded, so more like E+8kg for a tanker, and your collision needs to be about nine orders of magnitude (a billion times) larger than that - not five. That's about 20 times the size of Eros. | |
| Sep 8, 2020 at 15:02 | comment | added | Martin Modrák | My (shallow) understanding of graviational waves and LIGO is that LIGO is sensitive only to some frequencies of gravitational waves (e.g. see commons.wikimedia.org/wiki/…), so beyond having enough energy the waves would also need the right frequency. I however have no idea what influences the frequency of gravitational waves... | |
| Sep 8, 2020 at 14:21 | comment | added | Mindwin Remember Monica | @camelccc I fixed it. Turns out e13 kilograms of mass are five oil tankers. | |
| Sep 8, 2020 at 14:21 | history | edited | Mindwin Remember Monica | CC BY-SA 4.0 |
added 67 characters in body
|
| Sep 8, 2020 at 13:55 | comment | added | camelccc | gravitational waves do not follow an inverse square law, they decay as 1/r, being a quadropole wave they do not emit isotropically. depending on your direction, they will either be easy to detect, or impossible. . | |
| Sep 8, 2020 at 13:48 | history | answered | Mindwin Remember Monica | CC BY-SA 4.0 |
