4 ms·

What makes a planet an "alien" planet?

• Rerarom 7y ago
  Not being in our Solar System, I guess.
• makerofspoons 7y ago
  It is part of a different solar system: https://en.wikipedia.org/wiki/Exoplanet https://en.wikipedia.org/wiki/Exoplanet
• onemoresoop 7y ago
  I never encountered the term alien planet but exoplanets are planets outside our solar system. In a way all planets are alien to one another. Alien to us is anything extraterrestrial in this context.
• infradig 7y ago
  The media.
• lucb1e 7y ago
  Yeah that was my first thought when reading the headline: "yet another habitable planet found" is getting old, now we need to mention it's "alien" (generally associated with green men, or more broadly, life not originating from earth; not with a planet) to get attention.