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'''Hydrology''' is a science concerned with the properties of the Earth's water, especially its movement in relation to land. ...ater in various forms. For students interested in off-world water, several lectures have been included. ...

{{main|Keynote lectures/Astronomy}} ...: let the symbol <math>\oplus</math> indicate the [[Keynote lectures/Earth|Earth]]. ...

{True or False, Electrons in the Earth's magnetosphere are energized by neutral particles from the Sun {Which of the following is associated the Earth's geodynamo? ...

==Earth system== {{main|Planets/Earth/System|Earth system|Earth and Moon}} ...

'''Notation''': let the symbol <math>R_\oplus</math> indicate the Earth's radius. ...ese is the astronomical unit. It is a unit of length approximating the Sun-Earth distance (of about 150 million kilometres) which is of convenient use in as ...

...ral galaxies. It is the brightest of the three galactic mergers closest to Earth, about 250 million light-years away in the constellation of Serpens, the Se Apart from the [[Earth|global]] continental regions, there are also hydrospheric and atmospheric r ...

* [[Keynote lectures/Detectors for radiation astronomy|Detectors for radiation astronomy]] (116 * [[Keynote lectures/Magnetic field reversals|Magnetic field reversals]] ...

...shed 1921)<ref>Lämmel (1920/21), p. 84ff</ref> again alluded to Einstein's lectures in Zürich, describing a discussion between himself and Einstein. After Eins ...28, Lämmel became somehow aware of the content of Langevin's or Wiechert's lectures held a few weeks earlier, in order to use them in his description of Einste ...

...c storm is caused by a coronal mass ejection from the sun that strikes the Earth's atmosphere. These mass ejections contain large amounts of particles that |title=The Effects of Earth's Upper Atmosphere on Radio Signals ...

...constellation [[w:Lepus (constellation)|Lepus]] about 19 light years from Earth. The brown dwarf, called Gliese 229B, is about 20 to 50 times the mass of J ...Carina Nebula itself is a star-forming region about 7500 light-years from Earth in the southern constellation of Carina (The Keel: part of Jason’s ship the ...

* [[Charges/Interactions/Electromagnetics/Electric fields/Earth|Natural electric fields]] [[Category:Astrophysics/Lectures]] ...

[[Image:Earth poster.svg|thumb|right|250px|Diagram is of the Earth. Credit: [[commons:User:Kelvinsong|Kelvinsong]].]] '''Geognosy''' is the science and theory of the constitution of the Earth. ...

As [[geography]] describes the features of the surface of the [[Earth]], '''heliography''' describes the surface features of Helios or the Sun, S ...uary 1, 1854 (JD 2398220.0) and rotating with the sidereal period of 25.38 Earth days.<ref name=Heliographic/> ...

...ts or rises in relation to the horizon, the light it emits travels through Earth's [[w:atmosphere|atmosphere]], which works as a [[w:Prism (optics)|prism]] [[Category:Radiation astronomy/Lectures]] ...

...amount of charge on one body, e.g., 1.54 x 10²⁴ e.s.u. for the earth and 5.16 x 10²⁹ e.s.u. for the [[Stars/Sun|sun]]."<ref name=Cook ...out 10⁶ e.s.u. per second for the whole earth the charge on the earth would increase at a rate of at least 10¹³ e.s.u. per year."<ref ...

...0 newtons (about the weight of a one-metric ton mass on the surface of the Earth) is enough to create particle-antiparticle pairs within a very short distan [[Category:Radiation astronomy/Lectures]] ...

...s]]. It "shows a half crescent due to the relative orientation of the Sun, Earth and Venus. The X-rays from Venus are produced by fluorescent radiation from [[Category:Atmospheric sciences/Lectures]] ...

...|250px|Solar irradiance spectrum is diagrammed above atmosphere and at the Earth's surface. Credit: [[w:User:Dragons flight|Robert A. Rohde]].]] ...y, solar flares are a type of solar activity that can impact human life on Earth by affecting electrical systems, especially satellites. Flares usually occu ...

"Apart from the [[Earth|global]]continental regions, there are also hydrospheric and atmospheric re ...may be unique to the northern hemisphere or cultures that also overlap the Earth's equator into the northern hemisphere. ...

...shows some of the major units of geological time and definitive events of Earth history. Credit: [[c:user:Woudloper|Woudloper]].]] ...gy#Hadean|Hadean]] eon represents the time before fossil record of life on Earth; its upper boundary is now regarded as 4.0 Ga (billion years ago).<ref name ...