There is no scientific evidence to suggest that humans have alien ancestry or that there are any physical characteristics that would indicate someone is "part alien."

The idea of alien hybrids is a popular theme in science fiction, but it remains purely speculative.

Here's why:

* No evidence: There is no concrete evidence to support the existence of extraterrestrial life, let alone interbreeding with humans.

* Biological incompatibility: Humans and any hypothetical alien species would likely be biologically incompatible at a fundamental level. Our DNA and genetic structures are extremely complex and unique to Earth.

* Evolutionary constraints: Evolution works through gradual changes over long periods. It's highly unlikely that any alien species would be genetically compatible enough to produce offspring with humans.

It's important to rely on scientific facts and evidence when considering such topics.