Linked Questions

1
vote
2answers
160 views

Can average citizen communitcate with Proxima Centauri? [duplicate]

So, we found out there is habitable planet orbiting around Proxima Centauri. Just 4 light years away. Hooray! But, puts tinfoil hat on, what is still being hidden is, that there is intelligent race ...
0
votes
0answers
64 views

If there's a human-level civilization in a nearby star system, would we detect it? [duplicate]

So, I'm not into writing or creating any new worlds, but this question (or a set of questions) was bothering me for a while and I thought it's a good place to ask. If there exists an alien ...
45
votes
24answers
22k views

Why do aliens who visit us have higher tech than us? Couldn't they wait for us to have it too?

It is a well known fact that if aliens invaded, it would be our puny kill-one-person-then-reload-for-half-a-second-or-more-firearms against their super-cool-ultra-mega-thingy-laser-mumble-quantum-...
30
votes
20answers
8k views

Two or more advanced civilizations aren't even aware of each other

Humans have achieved FTL and have colonized several planets in our greater stellar neighborhood. While we have discovered several planets that harbor life as we know it, we have not yet discovered ...
25
votes
17answers
7k views

Need a way for Earth not to detect an extrasolar civilization that has radio

The exposition is that a civilization exists about 200 light years from earth and has been capable of radio communication for several thousands of years. They are not trying to hide from detection but ...
34
votes
9answers
8k views

Could the atmosphere be compressed and put into bottles?

I just had an idea – likely an absurd one – but it could make an interesting plot. Picture this scenario – Present day earth. (easy to picture) But, there is an antagonist. He has a facility full of ...
11
votes
5answers
1k views

What can cause the aliens not to understand our signal?

I am wondering if alien race detecting our signal could actually understand such broadcast. But for my story, I need the aliens being unable to understand what we are broadcasting. How can I achieve ...
17
votes
2answers
2k views

Aliens picking up human radio and TV: how might it really happen?

In the Carl Sagan novel Contact and the 1997 film of the book, aliens from Vega have picked up TV pictures of Hitler opening the 1936 Olympics, which is depicted as the first TV signal powerful enough ...
8
votes
4answers
496 views

Finding Signs of Life from afar

If I were to attempt the colonization of a planet with preexisting life, how would I manage to pinpoint a candidate planet from the comforts of Earth's orbit? I am interested in the stars somewhere ...
3
votes
5answers
519 views

How to conceal your destination in space?

The Intergalactic Colonization Authority has a problem. They've recently discovered this awesome planet they want to colonize, but it's located in a part of the universe most of the rest of the ...
6
votes
5answers
627 views

Given present-day Earth as we know it, how could I fake a radio transmission as coming from a distant star?

Setting: Western world nation, Earth as we know it, May 2016, Gregorian calendar. Eccentric billionaire, large multinational corporation or similar; lots of money, and ability to enlist the help of ...
2
votes
6answers
331 views

How to get high atmospheric pressure with 1g

I'm assuming that to hold onto more atmosphere, the planet would have to have more gravity, or the atmosphere itself would have to be comprised of denser gasses. So, assuming that the planet has a ...
2
votes
4answers
475 views

Is moving faster than light speed a paradox? [closed]

Let's assume that somehow humanity invented a teleporting machine that could momentarily transport a person over very large distances (up to several light years). As we know, the speed of light is ...
3
votes
3answers
233 views

How feasible is it for authorities to track down a spy from signal leakage of a tightbeam transmission?

If a spy is getting a fix on a satellite and transmitting a tightbeam transmission to it (encrypted of course), there will be signal leakage. Can the spy be detected by the good guys, by them noticing ...
12
votes
1answer
230 views

How much electromagnetic transmission noise does Earth have to emit to be noticeable?

From time to time I'll see things talking about how thanks to all of our radio communications, we're effectively broadcasting our existence to the entire universe. However, when I did some back-of-the-...

15 30 50 per page