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- https://phys.libretexts.org/Courses/Joliet_Junior_College/Physics_201_-_Fall_2019v2/Book%3A_Custom_Physics_textbook_for_JJC/07%3A_Applications_of_Newton/7.11%3A_Introduction_to_UCM_and_GravitationUniform circular motion is a motion in a circular path at constant speed.
- https://phys.libretexts.org/Bookshelves/Astronomy__Cosmology/Astronomy_2e_(OpenStax)/02%3A_Observing_the_Sky_-_The_Birth_of_Astronomy/2.02%3A_The_Sky_AboveThe direct evidence of our senses supports a geocentric perspective, with the celestial sphere pivoting on the celestial poles and rotating about a stationary Earth. We see only half of this sphere at...The direct evidence of our senses supports a geocentric perspective, with the celestial sphere pivoting on the celestial poles and rotating about a stationary Earth. We see only half of this sphere at one time, limited by the horizon; the point directly overhead is our zenith. The Sun’s annual path on the celestial sphere is the ecliptic—a line that runs through the center of the zodiac, which is the 18-degree-wide strip of the sky within which we always find the Moon and planets.
- https://phys.libretexts.org/Bookshelves/University_Physics/Physics_(Boundless)/5%3A_Uniform_Circular_Motion_and_Gravitation/5.1%3A_Introduction_to_UCM_and_GravitationUniform circular motion is a motion in a circular path at constant speed.
- https://phys.libretexts.org/Bookshelves/Astronomy__Cosmology/Introduction_to_Astronomy_(Lumen)/02%3A_Historical_Astronomy/2.05%3A_The_WanderersThis page explains that the term "planet" comes from the Greek word for "wanderer" and lists historically recognized planets, such as Mercury, Venus, Mars, Jupiter, Saturn, and Earth. It notes that Me...This page explains that the term "planet" comes from the Greek word for "wanderer" and lists historically recognized planets, such as Mercury, Venus, Mars, Jupiter, Saturn, and Earth. It notes that Mercury and Venus are seen near the Sun, while Mars, Jupiter, and Saturn exhibit retrograde motion, appearing to move backward in the sky.
- https://phys.libretexts.org/Bookshelves/Astronomy__Cosmology/Introduction_to_Astronomy_(Lumen)/09%3A_Minor_Bodies_of_the_Solar_System/9.08%3A_Meteoroids_Meteors_and_MeteoritesThis page clarifies the differences between meteoroids, meteors, and meteorites, noting that meteoroids are smaller space materials, meteors are visible streaks in the sky, and meteorites are those th...This page clarifies the differences between meteoroids, meteors, and meteorites, noting that meteoroids are smaller space materials, meteors are visible streaks in the sky, and meteorites are those that land on celestial bodies. Additionally, it mentions Thomas Jefferson's skepticism regarding meteorites.
- https://phys.libretexts.org/Bookshelves/Astronomy__Cosmology/Introduction_to_Astronomy_(Lumen)/06%3A_Solar_System_Formation_and_Other_Stellar_Systems/6.03%3A_What_is_a_PlanetThis page discusses the IAU's 2006 decision to classify Pluto as a dwarf planet due to its inability to clear its orbital neighborhood, reducing the solar system's planet count from nine to eight. Thi...This page discusses the IAU's 2006 decision to classify Pluto as a dwarf planet due to its inability to clear its orbital neighborhood, reducing the solar system's planet count from nine to eight. This reclassification sparked ongoing debates in the scientific community, especially after the New Horizons mission, which focused on exploring Pluto and its moons.
- https://phys.libretexts.org/Bookshelves/Astronomy__Cosmology/Introduction_to_Astronomy_(Lumen)/07%3A_The_Rocky_Planets/7.06%3A_Planet_VenusThis page describes Venus as Earth's twin, highlighting its similar size and atmosphere. It is the closest planet to Earth and the second brightest in the night sky, known as the Morning and Evening S...This page describes Venus as Earth's twin, highlighting its similar size and atmosphere. It is the closest planet to Earth and the second brightest in the night sky, known as the Morning and Evening Star. Key features include numerous craters, over 1,600 volcanoes, a dense carbon dioxide atmosphere, high pressure, lack of water and polar caps, erosion, dunes, and no known life or satellites.
- https://phys.libretexts.org/Courses/Joliet_Junior_College/Physics_201_-_Fall_2019/Book%3A_Physics_(Boundless)/6%3A_Applications_of_Newton/6.11%3A_Introduction_to_UCM_and_GravitationUniform circular motion is a motion in a circular path at constant speed.
- https://phys.libretexts.org/Courses/Prince_Georges_Community_College/PHY_1030%3A_General_Physics_I/05%3A_Uniform_Circular_Motion_and_Gravitation/5.1%3A_Introduction_to_UCM_and_GravitationUniform circular motion is a motion in a circular path at constant speed.
- https://phys.libretexts.org/Bookshelves/Astronomy__Cosmology/Introduction_to_Astronomy_(Lumen)/07%3A_The_Rocky_Planets/7.05%3A_Planet_MercuryThis page provides an overview of Mercury, highlighting it as the smallest and closest planet to the Sun, with no significant atmosphere, extreme temperature fluctuations, and a cratered surface simil...This page provides an overview of Mercury, highlighting it as the smallest and closest planet to the Sun, with no significant atmosphere, extreme temperature fluctuations, and a cratered surface similar to the Moon's. It mentions Mercury's inactive geological features, presence of water and ice in polar regions, and absence of erosion, dunes, polar caps, and natural satellites, while the potential for life is still uncertain.
- https://phys.libretexts.org/Bookshelves/Astronomy__Cosmology/Introduction_to_Astronomy_(Lumen)/08%3A_The_Gas_Giant_Planets/8.10%3A_Planet_NeptuneThis page discusses Neptune, discovered in 1846 through calculations by Le Verrier and Adams. As an Ice Giant, it is smaller and denser than Uranus, featuring the Great Dark Spot storm and fast-moving...This page discusses Neptune, discovered in 1846 through calculations by Le Verrier and Adams. As an Ice Giant, it is smaller and denser than Uranus, featuring the Great Dark Spot storm and fast-moving atmospheric scooters. Neptune has five broken rings and 14 moons, with Triton being notable for its retrograde motion and volcanism. Its atmosphere is more active than Uranus', highlighting Neptune's dynamic nature in the solar system.
