There is a thing called night vision.
The worst thing you can do is turn on/use a flashlight at night.
Not only does it make you a target it kills your night vision.
Basic combat strategies.
Simple logic.
If you know the ants will attack your foot you do not step on the ant hill.
However, if you have a full hazard suit (advanced technology) you wouldn't care if the ants attack because they can't get by your protection.
We're talking about beings that traveled utterly vast distances to get here.
You are right about time.
Time is linear from our perspective.
One moment leads to the next and the next and so on.
However, if one were able to isolate the time physics, one might find that time is a series of moments of reality.
There are some pretty fundamental issues with traveling into the past (the future hasn't happened yet).
Not only would that being need to know all the details of that specific place and time destination, they would require its exact location in reality.
Since everything is moving (in flux) within this Universe, quite a feat.
The Earth is not in the same place as it was a year ago.
The Sun is not in the same place as it was a year ago.
The galaxy is not in the same place as a year ago.
If you could calculate the exact location of the destination and had the understanding and equipment to make the jump, chances are you would land in space or inside the planet.
So you have density detectors that keep you from jumping into solid objects but that leaves space.
So you build a craft using you latest technology to make the jump.
A craft able to maneuver in space or in the air.
Thing is...
Consider a 1850s hot air balloon encountering a harrier jet?
Consider a 1960s jet encountering a stealth fighter.
A UFO makes impossible maneuvers at incredible speeds, according to our current understanding of technology.
Their technology may be so far advanced it looks unreal but might just be their current cutting edge technology.
As for reasons, who knows?
Perhaps they need an enzyme that humans no longer produce?
Perhaps they are looking for genes to repopulate a once devastated planet.
Maybe the are looking for possible food sources - not the actual food but a means to grow their own?
These questions could be endless.
The thing is, space is really, really big and really, really spread out.
An alien race coming here for whatever reason would need to be good, really good.
Every resource on/in this planet is available in greater quantities elsewhere.
Life is not as rare as we think if there is an alien able to visit us.
That is an indication that life exists at least two places in the Universe and given the vast space, likely, more than likely, life is common.
Plus, studies of meteorites and other off-world sources have indicated that the building blocks of life are abundant.
So, given the right environmental conditions life can crop up anywhere in the Universe.
What...Makes...Earth...So...Special?
Humans?
Really?
Why?
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