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  2. youtube-dl - Wikipedia

    en.wikipedia.org/wiki/Youtube-dl

    youtube-dl -o <path> <url> To see the list of all of the available file formats and sizes: youtube-dl -F <url> The video can be downloaded by selecting the format code from the list or typing the format manually: youtube-dl -f <format/code> <url> The best quality video can be downloaded with the -f best option.

  3. Astrophysics - Wikipedia

    en.wikipedia.org/wiki/Astrophysics

    Astrophysics is a science that employs the methods and principles of physics and chemistry in the study of astronomical objects and phenomena. [1] [2] As one of the founders of the discipline, James Keeler, said, astrophysics "seeks to ascertain the nature of the heavenly bodies, rather than their positions or motions in space—what they are, rather than where they are", [3] which is studied ...

  4. Adam Powell (game designer) - Wikipedia

    en.wikipedia.org/wiki/Adam_Powell_(game_designer)

    In April 2000, Powell negotiated a significant investment in Neopets.com and transferred the company from the UK to Los Angeles, US. After the relocation, Powell remained on staff as creative director and technical lead. Under Powell's management, Neopets went from its initial launch to over 140 million accounts and 5 billion pageviews per month.

  5. Comparison of YouTube downloaders - Wikipedia

    en.wikipedia.org/wiki/Comparison_of_YouTube_down...

    Main page; Contents; Current events; Random article; About Wikipedia; Contact us; Special pages; Help; Learn to edit; Community portal; Recent changes; Upload file

  6. Free-fall time - Wikipedia

    en.wikipedia.org/wiki/Free-fall_time

    The free-fall time is the characteristic time that would take a body to collapse under its own gravitational attraction, if no other forces existed to oppose the collapse. As such, it plays a fundamental role in setting the timescale for a wide variety of astrophysical processes—from star formation to helioseismology to supernovae —in which ...

  7. Category:Astrophysics - Wikipedia

    en.wikipedia.org/wiki/Category:Astrophysics

    Astrophysics is the branch of astronomy that deals with the physics of the universe, including the physical properties (luminosity, density, temperature, chemical composition) of astronomical objects such as stars, galaxies, and the interstellar medium, as well as their interactions.

  8. Theoretical astronomy - Wikipedia

    en.wikipedia.org/wiki/Theoretical_astronomy

    The Oort cloud, one of the most successful theoretical models about the Solar System. Theoretical astronomy is the use of analytical and computational models based on principles from physics and chemistry to describe and explain astronomical objects and astronomical phenomena.

  9. Astrophysics for People in a Hurry - Wikipedia

    en.wikipedia.org/wiki/Astrophysics_for_People_in...

    Astrophysics for People in a Hurry is a 2017 popular science book by Neil deGrasse Tyson, centering around a number of basic questions about the universe. Published on May 2, 2017, by W. W. Norton & Company , the book is a collection of Tyson's essays that appeared in Natural History magazine at various times from 1997 to 2007.