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  2. William Kenneth Hartmann - Wikipedia

    en.wikipedia.org/wiki/William_Kenneth_Hartmann

    William Kenneth Hartmann (born June 6, 1939) is an American planetary scientist, artist, author, and writer.He was the first to convince the scientific mainstream that the Earth had once been hit by a planet sized body (), creating both the Moon and the Earth's 23.5° tilt.

  3. 24 Astronomy Facts You Never Learned in School

    www.aol.com/lifestyle/24-astronomy-facts-never...

    From a bar in the clouds to finding more water from the Moon, outer space is constantly surprising us. The post 24 Astronomy Facts You Never Learned in School appeared first on Reader's Digest.

  4. Astronomy - Wikipedia

    en.wikipedia.org/wiki/Astronomy

    Historically, optical astronomy, which has been also called visible light astronomy, is the oldest form of astronomy. [58] Images of observations were originally drawn by hand. In the late 19th century and most of the 20th century, images were made using photographic equipment.

  5. 105 Fun Facts About Science, History, Celebrities, and More - AOL

    www.aol.com/heres-103-fun-facts-actually...

    Ace trivia night with these cool and random fun facts for adults and kids. This list of interesting facts is the perfect way to learn something new about life. 105 Fun Facts About Science, History ...

  6. Umbra, penumbra and antumbra - Wikipedia

    en.wikipedia.org/wiki/Umbra,_penumbra_and_antumbra

    The penumbra (from the Latin paene "almost, nearly" and umbra "shadow") is the region in which only a portion of the light source is obscured by the occluding body. An observer in the penumbra experiences a partial eclipse.

  7. Arthur B. C. Walker Jr. - Wikipedia

    en.wikipedia.org/wiki/Arthur_B._C._Walker_Jr.

    Here, Walker directed the Space Astronomy Program from 1971 to 1973. [6] Much of his career involved using rocket technology and satellites to study the Sun's atmosphere at the ultraviolet and X-ray levels. [3] He was a professor at Stanford University from 1974 until his death in 2001. Walker started as the associate professor of applied ...

  8. Henry Norris Russell - Wikipedia

    en.wikipedia.org/wiki/Henry_Norris_Russell

    There were two volumes: the first was The Solar System and the second was Astrophysics and Stellar Astronomy. The textbook popularized the idea that a star's properties (radius, surface temperature, luminosity , etc.) were largely determined by the star's mass and chemical composition, which became known as the Vogt–Russell theorem (including ...

  9. Interplanetary dust cloud - Wikipedia

    en.wikipedia.org/wiki/Interplanetary_dust_cloud

    Artist's concept of a view from an exoplanet, with light from an extrasolar interplanetary dust cloud. The sources of interplanetary dust particles (IDPs) include at least: asteroid collisions, cometary activity and collisions in the inner Solar System, Kuiper belt collisions, and interstellar medium grains (Backman, D., 1997).