Space is the boundless three-dimensional extent in which objects exist and events occur and have relative position and direction. Physical space is often conceived in three linear dimensions, although modern physicists usually consider it, with time, to be part of a boundless four-dimensional continuum known as spacetime. In mathematics, "spaces" are examined with different numbers of dimensions and with different underlying structures. The concept of space is considered to be of fundamental importance to an understanding of the physical universe. However, disagreement continues between philosophers over whether it is itself an entity, a relationship between entities, or part of a conceptual framework. Read more on wikipedia
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A newly developed imaging technique from the Florida Institute of Technology may aid in the search for Earth-like planets and the "candle and lighthouse" problem.
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Study finds that Martian Lakes may be connected to an ancient and habitable environment that existed billions of years ago.