Evidence for ET?

[Anomalocaris]

The Same to you.

[Gawdzilla Sama]

I've invaded the third grade classroom.

[Anomalocaris]

Go back to the second grade then.

[Jehanne]

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Jupiter emits twice as much EM as it absorbs from the Sun.  If there were large numbers of Jupiter-sized objects in interstellar spaces (MACHOS), they would have been detected via gravitational lensing, occultations, etc.  Such objects have not been found in large numbers.  Ergo, most large objects form around stars.

Machos suppose a truly enormous numbers of compact planet like objects floating through Milky Way sufficient in total to rival and exceed the mass of all the stars in Milky Way and make up a major portion of the missing matter known to effect milky way’s rotation.

I think that scenario is discredited.

But the notion that Milky Way still has a large number of free floating planets similar in head count to the total number, but not mass, of stars in the Milky Way rather gained support.  There have been gravitation lensing events attributed to free floating planets.   This does not contradict the notion that most large objects form around stars.  Most of the free floating planets could have formed around stars and then subsequently ejected from their system of birth.

I agree 100%.  There are large numbers of Jupiter-sized objects in interstellar space (probably, very few in intergalactic space, due to the necessary escape velocity), but space being so vast and given the local standard of rest, it would be interesting to see some calculations on how many intersteller interlopers may be out there.  If Oumuamua is a completely natural phenomenon, then it is more probable than not that such be observed again in the future.  If it is ET, then its visit to our Solar System may be completely unique.