Science fiction stories about “alien” invaders are often political allegories for anxieties around immigration. Now, a government website depicts non-citizens as extraterrestrials.

Astrophysicist Neil deGrasse Tyson, 67, explained how any alien visitor from another planet would likely look very different ...

Asked when they humans will likely have contact with extraterrestrials, an eye-popping 21% said, “We already have,” according ...