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12

Something else happened that day and nobody was looking there Years ago, there was an important earthquake in Indonesia (of magnitude 6,5). About 10 confirmed deaths and thousands of houses, schools and buildings destroyed. It was one of the ten stronger earthquakes that year. Yet no media covered it. Why? It happened on september 11, 2001 (1). A lot of ...


7

Earth is still mostly an empty planet. Wast stretches of ocean and entire continents like Antarctica have virtually no observers. If spaceship appeared over an unpopulated area and descended to the surface without crossing over any populated area, its appearance and demise would be unnoticed. However, if it would be flying through Earth atmosphere without ...


5

Since TTX is a neurotoxin, and said aliens will have neurons, will the toxin not also affect them? Why would alien biochemistry be anything even remotely like terrestrial biochemistry? Sure, they might have things which are analogous to nerves, but every other detail could (and most likely would) be totally different, in the absense of some magical ...


4

One of the key adaptations for flight is lightness, particularly in bone structure. Weight, where needed, is optimised to support flight: even birds of prey don't have big muscly legs, for their killing impact they rely on sharp claws and beak. So your creatures, if human-sized, would be considerably less robust than a human, less able to carry heavy weights ...


4

The exact comparison is difficult to make as it would depend on how the creatures used their wings. If they spent a lot of time soaring and gliding they might be able to get away with much less strength than creatures that had to climb and dive a lot to escape predators. That said it is entirely reasonable to assume that the creatures and humans would be of ...


4

I’ll help you understand what it means to be 1,000 ly away. First, it won’t be possible, in any way, to beam a radio signal to the planet, or to see it: the planet is rogue, that means you don’t know where it is. And that means you don’t know where to aim your radio beam. Also, even if you were able to see where it is, you are seeing where it was 1,000 ...


3

In order for this to work you'd need something more than 'photographs'. The problem you're describing is basically the same 'solve for x' trig problem that we all did ad nauseum in school. Position relative to another object is always measured in three values, and if you know any two of them you can solve for the third. In this case, the two values that ...


2

I'm surprised nobody has mentioned the neutron bomb. In a neutron bomb, the casing material is selected either to be transparent to neutrons or to actively enhance their production. The burst of neutrons created in the thermonuclear reaction is then free to escape the bomb, outpacing the physical explosion. By designing the thermonuclear stage of ...


2

Humans already do this. Desert climates have extreme variation in temperature every day. They quickly rise to temperatures like 120 Fahrenheit during the day and then fall to below freezing during the night. And humans have lived in climates like this for ages. Because this is an alien species we are talking about, it is very reasonable to say that they ...


2

If the planets are on a collision course, they can't be stopped Simple physics, really. A planet has mass, and it takes force to move that mass. The more mass, the more force. How much mass does the Earth have? 5.9 * 10^24 kg. Mars is slightly less, 6.4 * 10^23 kg. So if we were to move one of them, we'd have to move the Mars one. The problem is that we don'...


1

The neurotoxin might or might not affect them, we can’t tell for sure from what you have told us. However I suggest that a truly alien life form would have followed a completely different evolutionary path from the earliest origins of life. The alien’s biochemical pathways will almost certainly be completely different to ours so I doubt very much TTX would ...


1

the Moon exploded and a planet about the size of Mars appeared If N'valdir is further away then the moon; but both the earth and N'valdir are caught in a gravity well with the moon. The moon then breaking apart due to tidal forces. That could have left both communities time to wonder if the result has a stable barycenter. If stable then I would expect the ...


1

The spacecraft is the size of a walnut. It was not noticed because it is small. Many such tiny objects crash into the Earth; some make it all the way down and hit the surface. They are meterorites. Persons watching the sky might have seen this spacecraft glow on entering the atmosphere and assumed it was a meteorite. Those who were aware of its true ...


1

I think it is possible. Just simple maths and very big computers and databases. Start by identifying a couple of stellar objects on these pictures. Then calculate at which time and place the objects would be in the relative positions on each image. A series of images would give the flightpath of the planet. It would be easier if there was data on very ...


1

Star Clusters As a few people have mentioned, a photograph, even a very high resolution one, isn't going to give the sort of detailed spectrographic or astronomic data that would be needed to definitively identify any singular star in the image. This makes it difficult to fix points to begin triangulating from. However, if there was a star cluster visible,...


1

Assuming that the photographs include the entire sky of the alien planet and includes magnified telescopic images, the civilization that receives the photographs may be able to pinpoint the location that the photographs were taken at. Thus the alien civilization might receive thousands of separate photographs to cover the entire sky of the mystery planet. ...


1

You can do that if you have a database with the exact location and brightness of stars over time. If you have this you can look at the problem backwards. From the database you can compute what the sky would look like from a particular point in space and time. From this point you have the distance to any visible star and its absolute brightness, so you ...


1

We do OK with temperature extremes. St.Louis has weather pretty much as you describe and you can live in the same house all year. It would be nice to have a thermostat that automatically switched between air conditioning and furnace instead of you having to pick HEAT or COOL, because you would probably use both in a day. Ideally a house like this would be ...


1

dropping an asteroid onto it or nuclear weaponry is not ideal as they would have to wait a long time for the planet to recover Yes it's ideal, and no they wouldn't have to wait. First off, it's not going to "damage the Earth". Even one dinosaur-killer asteroid would only make one fairly small dent which would be indistinguishable from a natural volcano. Of ...


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