What sensors might alien craft have?

[ChrisIB]

We now scan for sink holes using microgravity. Using neutrino detectors ufos could perhaps turn a knob and render buildings effectively semi transparent. In combination with advanced gravity measurement that gives holographic imagery at a distance. They could look into the core of the Earth and see earthquake movements.
Then they may be able to literally count the atoms coming off your body to give precise chemical insight and AI to scan your brains electrical activity to read your thoughts.
What other sensors might they have?

 

[SOUL-DRIFTER]

Sensors to detect temporal anomalies or portals that have been opened within a 24 hour period.
Some means of sensors may use exotic elements in their design and still others may use techyons or particles we have yet to discover.

 

[Toroid]

They could have sensors to detect incoming objects like asteroids. With a gravity drive that works instantaneously they to get to an object and destroy it before it reaches the ground. I think something like that happened over Russia a couple of years back.

 

[ChrisIB]

It always puzzled me how ufos with such tech might crash here. One possible is a lot of probes were sent at the same time by different civilisations, perhaps due to our nuclear testing. They would be stealthed, perhaps some collided.
If we wanted to defeat such systems, sensors can always be overloaded, though if we tried that they would just vacate.

 

[nivek]

It always puzzled me how ufos with such tech might crash here.

It sounds like you are thinking in terms of all aliens who visit here having the same technology and/or level of technology which is most likely incorrect...They could have similar propulsion systems or have the ability to travel to this planet but their technology would not necessarily prevent them from crashing their vessel or having some sort of technical failure...

All the engineering that goes into design and safety features to make our vehicles on the roads safer we still have serious car crashes that result in deaths, even putting aside those who abuse alcohol or other substances...Simply put, accidents happen, even if rare...

...

 

[Toroid]

It always puzzled me how ufos with such tech might crash here. One possible is a lot of probes were sent at the same time by different civilisations, perhaps due to our nuclear testing. They would be stealthed, perhaps some collided.
If we wanted to defeat such systems, sensors can always be overloaded, though if we tried that they would just vacate.

In the Wingmakers interviews Dr. Jamisson Neruda said ships can crash because of the unique nature of the core of the planet increases their density.

 

[ChrisIB]

Agreed, but a madcap part of me still wants to believe they were deliberately left for us to reverse engineer, say by those with a vested interest in us quickly developing a star drive (who overestimated our physicists or underestimated the anal retentive nature of our military)

 

[spacecase0]

when looking at how they might fly,
they could be messed up by high power microwaves,
I doubt they were expecting to get hit with radar on earth.
they likely use passive detection systems, so getting pummeled with that kind of disruption likely was not expected.

 

[humanoidlord]

the same stuff we send in your's space probes, with maybe some new stuff between them

 

[SOUL-DRIFTER]

It always puzzled me how ufos with such tech might crash here. One possible is a lot of probes were sent at the same time by different civilisations, perhaps due to our nuclear testing. They would be stealthed, perhaps some collided.
If we wanted to defeat such systems, sensors can always be overloaded, though if we tried that they would just vacate.

In more than one case and report it was said that most were downed by other visitors or their enemies. The most likely scenario given the technology level.