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What if the Moon Didn't Exist is a collection of speculative articles about different versions of Earth, published in book form in 1993. They were originally published in Astronomy magazine . Contents
Theia or Orpheus, [21] a Mars-sized impactor believed to have collided with the Earth roughly 4.5 billion years ago; an event which created the Moon. Evidence from 2019 suggests that it may have originated in the outer Solar System. [22] Vulcan, a hypothetical planet once believed to exist inside the orbit of Mercury. Initially proposed as the ...
Thus far, however, earth- and space-based telescopes and the NASA Parker Solar Probe have detected no such asteroids. While three Atira asteroids have perihelion points within the orbit of Mercury, their aphelia are outside Mercury's orbit. Therefore, they cannot be defined as Vulcanoids, which would require wholly intra-Mercurian circular ...
In philosophy, the problem of the creator of God is the controversy regarding the hypothetical cause responsible for the existence of God, on the assumption God exists.It contests the proposition that the universe cannot exist without a creator by asserting that the creator of the Universe must have the same restrictions.
The Rare Earth hypothesis argues that planets with complex life, like Earth, are exceptionally rare.. In planetary astronomy and astrobiology, the Rare Earth hypothesis argues that the origin of life and the evolution of biological complexity, such as sexually reproducing, multicellular organisms on Earth, and subsequently human intelligence, required an improbable combination of astrophysical ...
Philolaus believed there was a "Counter-Earth" (Antichthon) orbiting the "Central Fire" (not labeled) that was not visible from Earth. The upper illustration depicts Earth at night while the lower one depicts Earth in the day. [1] The Counter-Earth is a hypothetical body of the Solar System that orbits on the other side of the Solar System from ...
The following video is part of our "Motley Fool Exclusive Interview" series. In this segment, Fool.com analyst Brendan Byrnes interviews author and Bloomberg reporter Jason Kelly about his recent ...
The eternity of the world is the question of whether the world has a beginning in time or has existed for eternity.It was a concern for ancient philosophers as well as theologians and philosophers of the 13th century, and is also of interest to modern philosophers and scientists.