• A.D.: “Anno Domini” or “in the year of our Lord”, so after Christ’s birth.
  • Adjacent: close or near; sharing a border, wall, or point. Merriam-Webster.
  • Ancient: "from a long time ago", like ancient civilizations and monuments. Cambridge  Dictionary.
  • Archaeologist: those who study material remains of past human life, like fossils, artifacts, and monuments.
  • Astronomer: a scientist who studies astronomy (“celestial objects, space, and the physical universe as a whole”). Oxford Dictionaries.
  • B.C.: Before Christ
  • Hoax: an act intended to deceive, not a real/natural occurrence.
  • Infinite: “Limitless or endless in space, extent, or size; impossible to measure or calculate. Oxford Dictionaries.
  • Light-Year: a unit of length in astronomy equal to the distance that light travels in one year in a vacuum or about 5.88 trillion miles (9.46 trillion kilometers). Merriam-Webster.
  • Scientific evidence: “information gathered from scientific research, which takes a lot of time (and patience!) to conduct. But there are a few things that all this research needs to have in common to make it possible and acceptable ---read more here: Phys.org.
  • Skeptical: Having doubts about statements (news, pictures, videos, etc.) that seem "too good to be true" (that's our own definition).
  • Solar System: our sun and the planets that move around it.
  • Supernatural: something unnatural, “attributed to some force beyond scientific understanding or the laws of nature”. A term usually given to something that is said cannot be explained by nature or science. Oxford Dictionaries.
  • Testimony: a formal written or spoken statement, especially given in a court of law. Also: evidence or proof provided by the existence or appearance of something. Oxford Dictionaries.
  • Vague: Not clear, not having or giving enough details or information about something. Oxford Dictionaries.