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  2. GK Persei - Wikipedia

    en.wikipedia.org/wiki/GK_Persei

    GK Persei (also Nova Persei 1901) was a bright nova first observed on Earth in 1901. It was discovered by Thomas David Anderson , an Edinburgh clergyman, at 02:40 UT on 22 February 1901 when it was at magnitude 2.7.

  3. Gerard K. O'Neill - Wikipedia

    en.wikipedia.org/wiki/Gerard_K._O'Neill

    After graduating from Cornell, O'Neill accepted a position as an instructor at Princeton University. [7] There he started his research into high-energy particle physics.In 1956, his second year of teaching, he published a two-page article that theorized that the particles produced by a particle accelerator could be stored for a few seconds in a storage ring. [1]

  4. Philosophical Problems of Space and Time - Wikipedia

    en.wikipedia.org/wiki/Philosophical_Problems_of...

    Philosophy of Space: Grünbaum critically examines the nature of space and questions related to its absolute or relative nature. He explores different theories of space and assesses their implications for our understanding of the physical world. Philosophy of Time: Grünbaum addresses the nature of time and its relationship to space.

  5. Introduction to the mathematics of general relativity - Wikipedia

    en.wikipedia.org/wiki/Introduction_to_the...

    High-precision test of general relativity by the Cassini space probe (artist's impression): radio signals sent between the Earth and the probe (green wave) are delayed by the warping of space and time (blue lines) due to the Sun's mass. That is, the Sun's mass causes the regular grid coordinate system (in blue) to distort and have curvature.

  6. Brief Answers to the Big Questions - Wikipedia

    en.wikipedia.org/wiki/Brief_Answers_to_the_Big...

    Brief Answers to the Big Questions is a popular science book written by physicist Stephen Hawking, and published by Hodder & Stoughton (hardcover) and Bantam Books (paperback) on 16 October 2018. The book examines some of the universe 's greatest mysteries, and promotes the view that science is very important in helping to solve problems on ...

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  8. Spacetime symmetries - Wikipedia

    en.wikipedia.org/wiki/Spacetime_symmetries

    Physical problems are often investigated and solved by noticing features which have some form of symmetry. For example, in the Schwarzschild solution, the role of spherical symmetry is important in deriving the Schwarzschild solution and deducing the physical consequences of this symmetry (such as the nonexistence of gravitational radiation in a spherically pulsating star).

  9. Human spaceflight programs - Wikipedia

    en.wikipedia.org/wiki/Human_spaceflight_programs

    The Space Shuttle was the only winged spacecraft to achieve orbit and land with crew aboard, and the first of a small number of reusable space vehicles to make multiple flights into orbit (subsequently followed by the X-37B, Cargo Dragon, and Crew Dragon).

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