The evidence supporting the existence of alien craft is the very same evidence used to support the existence of our sister planets and their satellite moons.There is no reliable evidence to support the existence of aliens.
This doesn't mean they don't exist, only that currently we have no credible reason to believe they exist.
First, we have human observation. Human observation alone is not considered to be reliable, however, corroborated human observation IS considered to be reliable. Just as there are corroborating humans making observations in the cosmos, there are corroborating humans making observations of what can only be alien craft operating in our world space.
Second, we have technological observation and evidence. Photographs have been used to capture and corroborate human observations made of the cosmos, and they have also been used to corroborate the observations of alien craft. Radio telescopes have been used to corroborate the existence of celestial bodies such as quasars and pulsars, and air and ground RADAR platforms have been used to corroborate the existence of alien craft.
Finally, we have physical evidence. Just as there are craters left behind by ancient meteor and asteroid impacts, there is also physical evidence left behind by alien craft that have landed on our planet. Soil samples that have been irradiated, and marks left in the soil by what can only be described as landing gear, have been observed and captured as evidence.
The evidence is out there, and has been for decades now. People simply choose to ignore it.
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