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Even for radio we went from blasting megawatts into space to keeping a lot of it in the atmosphere. We ourselves are proof that radio's a poor way to detect ali

Even for radio we went from blasting megawatts into space to keeping a lot of it in the atmosphere. We ourselves are proof that radio's a poor way to detect aliens and our reduction in radio emissions was a natural progression of our technology, not an attempt to hide. What's more telling for those in the neighborhood is the strange amounts of O2 in our atmosphere's spectral lines. That came to be long before us, it will persist long beyond us and it's a clear indicator of a non-geological process that might intrigue aliens.

saiya-jin 3y ago
Spectral lines may be telling about conditions suitable for certain type of life. But as per some theories life itself may be quite abundant in universe, but mostly primitive equivalents of stromatolites so it may not be that interesting for aliens to keep checking every single planet for such life in whole galaxy, especially if speed of light is absolute speed barrier. One other thing I came up with on a long evening walk recently was to check for gravity fields. If you have all bigger pieces of matter mapped well within galaxy, and you grok all physical laws there are, you should be able to predict movements and gravity fields for billions of years with high precision. Kind of make a complex checksum of given galaxy. If this changes for no predicted reason, bingo you just have a very strong candidate of life evolving enough to escape its planet and start moving big chunks of matter around (think big asteroids or changing orbit of planet slightly to ie counter some natural catastrophe like greenhouse effect / ice age, or living near slowly dying star). Obviously this is way ahead of us and maybe even not possible, just a fun thought. But if you start space mining company by any chance in the future, please don't move matter around too much.
- gizajob 3y ago
  Hmm it's a nice idea but gravity is such a weak force that it seems like it would be hard to move significant enough bits of matter around for it to be detectable. If they were going around annihilating whole stars and clusters then maybe.
  - midoridensha 3y ago
    Or if they built a stellar engine. https://en.wikipedia.org/wiki/Stellar_engine https://en.wikipedia.org/wiki/Stellar_engine

saiya-jin 3y ago

Spectral lines may be telling about conditions suitable for certain type of life. But as per some theories life itself may be quite abundant in universe, but mostly primitive equivalents of stromatolites so it may not be that interesting for aliens to keep checking every single planet for such life in whole galaxy, especially if speed of light is absolute speed barrier. One other thing I came up with on a long evening walk recently was to check for gravity fields. If you have all bigger pieces of matter mapped well within galaxy, and you grok all physical laws there are, you should be able to predict movements and gravity fields for billions of years with high precision. Kind of make a complex checksum of given galaxy. If this changes for no predicted reason, bingo you just have a very strong candidate of life evolving enough to escape its planet and start moving big chunks of matter around (think big asteroids or changing orbit of planet slightly to ie counter some natural catastrophe like greenhouse effect / ice age, or living near slowly dying star). Obviously this is way ahead of us and maybe even not possible, just a fun thought. But if you start space mining company by any chance in the future, please don't move matter around too much.

gizajob 3y ago
Hmm it's a nice idea but gravity is such a weak force that it seems like it would be hard to move significant enough bits of matter around for it to be detectable. If they were going around annihilating whole stars and clusters then maybe.
- midoridensha 3y ago
  Or if they built a stellar engine. https://en.wikipedia.org/wiki/Stellar_engine https://en.wikipedia.org/wiki/Stellar_engine