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Terrestrial planets

  • Mercury (planet)The MUL.APIN tablets from the 14th century BC contain the earliest known records of Mercury. An Assyrian astronomer wrote about this planet using cuneiform…
  • VENUSVenus is the second planet from the Sun, yet it shares a striking physical resemblance to Earth. It has a diameter of 12,104 kilometers, which is only about…
  • Terrestrial planetA terrestrial planet is a class of planet that is composed primarily of silicate, rocks, or metals. Scientists sometimes call these tellurian planets or…
  • MarsMars formed approximately 4.5 billion years ago alongside the other planets in our solar system. Scientists theorize that this creation resulted from a…
  • EarthThe Modern English word Earth developed from an Old English noun most often spelled ertha. This term has cognates in every Germanic language, tracing back to…