Search results

Jump to navigation Jump to search
View (previous 20 | ) (20 | 50 | 100 | 250 | 500)
  • ...me|geological scale]], let alone a [[Timeline of the Big Bang|cosmological one]]. Since there are many stars older than the sun, or since intelligent life ...s question"], Los Alamos Technical report LA-10311-MS, March, 1985.</ref> One participant recollects that Fermi then made a series of rapid calculations ...
    74 KB (11,058 words) - 14:34, 16 August 2009
  • ...uires a frequency- or wavelength-range. In order to calculate the redshift one has to know the wavelength of the emitted light in the rest frame of the so In general relativity one can derive several important special-case formulas for redshift in certain ...
    66 KB (9,812 words) - 01:07, 12 August 2009
  • ...end to gravitate towards the positive solution. To quantify this property, one would like to somehow capture this relative positivity (or negativity). To ...lular space and cell interior. Most channels are specific (selective) for one ion; for example, most potassium channels are characterized by 1000:1 selec ...
    115 KB (16,055 words) - 09:41, 18 August 2009
  • ...nd the Sun. Relative to Jupiter, each Trojan [[Libration|librates]] around one of the planet's two [[Lagrangian point]]s of stability, ''{{L4}}'' and ''{{ ...and a Greek name thus appears in the Trojan node; the Greek node also has one "misplaced" asteroid, 624 Hektor, named after a Trojan hero.<ref name=Wyse1 ...
    27 KB (3,965 words) - 06:02, 30 July 2009
  • ...neighborhood]].<ref>[http://www.chara.gsu.edu/RECONS/TOP100.posted.htm The One Hundred Nearest Star Systems], Todd J. Henry, RECONS, April 11, 2007. Acce ...per [[cubic centimeter]].<ref name="osln" /> White dwarfs are composed of one of the densest forms of matter known, surpassed only by other [[compact sta ...
    77 KB (11,681 words) - 21:21, 5 February 2010
  • ...e [[antiparallel (biochemistry)|anti-parallel]]. Attached to each sugar is one of four types of molecules called [[nucleobase|bases]]. It is the sequence ...is 22 to 26&nbsp;[[Ångström]]s wide (2.2 to 2.6&nbsp;[[nanometre]]s), and one nucleotide unit is 3.3&nbsp;Å (0.33&nbsp;nm) long.<ref>{{cite journal |auth ...
    95 KB (13,423 words) - 15:07, 12 April 2011
  • ...ects the Earth, mutual [[occultation]]s of Uranus's moons become possible. One such event, which last for about six minutes, was observed on May 4, 2007, ...
    25 KB (3,710 words) - 20:43, 4 August 2009
  • [[File:Pierre-Simon Laplace.jpg|thumb|Pierre-Simon Laplace, one of the originators of the nebular hypothesis]] ...rnova]]e occurred near the Sun while it was forming. A [[shock wave]] from one of these supernovae may have triggered the formation of the Sun by creating ...
    85 KB (12,829 words) - 17:09, 18 August 2009
  • ...orward-scattered light&mdash;about 300&nbsp;km.<ref name=Ockert-Bell1999/> One of the discoveries of the ''[[Galileo (spacecraft)|Galileo]]'' orbiter was ..., and structures visible in the back-scattered light.<ref name=Burns2004/> One possible explanation of the Thebe extension is influence of the electromagn ...
    40 KB (6,124 words) - 17:25, 21 July 2009
  • ...s recognized that a substance with anti-oxidative activity is likely to be one that is itself readily oxidized.<ref>Moreau and Dufraisse, (1922) ''Comptes ...nt system.<ref name="Vertuani" /> The amount of protection provided by any one antioxidant will also depend on its concentration, its reactivity towards t ...
    107 KB (14,648 words) - 05:34, 20 August 2009
  • ...y Press|year=2001|pages=xii|nopp=true}}</ref> and that, from time to time, one of their number "wanders from its own sphere and appears as an occasional v ...e=123 | issue=2 | pages=1039–1049 | year=2002 | doi=10.1086/338692 }}</ref>One such area of replenishment is the [[Oort cloud]]; the spherical swarm of co ...
    58 KB (9,031 words) - 16:11, 18 August 2009
  • ...iscussed the Moon's sphericity, its illumination by reflecting sunlight on one side and remaining dark on the other, and the nature of [[Solar eclipse|sol ...ies offered Zhang appointments to several offices, including a position as one of the [[Three Excellencies]], yet he acted modestly and turned down those ...
    76 KB (10,973 words) - 19:10, 5 August 2009
  • ...p=note>As of 2007, water vapor has been detected in the atmosphere of only one extrasolar planet, and it is a gas giant. See: {{cite journal ...ef> producing seasonal variations on the planet's surface with a period of one [[tropical year]] (365.24 solar days). Earth's only known [[natural satelli ...
    115 KB (16,384 words) - 01:33, 18 August 2009
  • Many critics lauded the album as Powderfinger's best work; one stated that the album was "the Finger's Crowning Glory", however, others we ...ussed love, a recurring motif in Fanning's songwriting. Fanning noted that one of the causes of this was his passion for [[soul (music)|soul]] and [[gospe ...
    24 KB (3,395 words) - 05:31, 16 August 2009
  • ...Like most known moons, Ganymede is [[tidal locking|tidally locked]], with one face always pointing toward the planet.<ref name="The Grand Tour">{{cite bo ...rior of Ganymede; the formation of the grooved terrain may be a result of one or more heating episodes.<ref name=Showman1999/><ref name=Showman1997a/> ...
    62 KB (9,204 words) - 08:32, 18 August 2009
  • ...Neptune. On 24 May 1981, they detected a dip in a star's brightness during one occultation; however, the manner in which the star dimmed did not suggest a ...x years, approximately 50 other occultations were observed with only about one third of them yielding positive results.<ref name="Sicardy1991" /> Somethin ...
    29 KB (4,327 words) - 17:10, 4 April 2011
  • ...stronomer]]. Although few details of his life are known, he is regarded as one of the leading [[scientist]]s in [[classical antiquity]]. Among his advance ...generally considered to be the greatest [[mathematician]] of antiquity and one of the greatest of all time.<ref>{{cite book |last=Calinger |first=Ronald | ...
    58 KB (8,563 words) - 01:30, 10 October 2011
  • ...the shape and orientation of the [[orbit (celestial mechanics)|orbit]] of one astronomical body around another, such as a planet revolving around a sun. ...d version of Figure 1, defining the angle θ between '''A''' and '''r''' at one point of the orbit.]] ...
    61 KB (8,970 words) - 23:12, 23 July 2009
  • ...he [[calculus of variations]], ''[[Noether's theorem]]'', has been called "one of the most important mathematical theorems ever proved in guiding the deve ...zed by [[poliomyelitis]] at the age of fourteen. He regained mobility, but one leg remained affected. Largely self taught, he was awarded a [[doctorate]] ...
    97 KB (14,013 words) - 22:11, 13 August 2009
  • ...eactions: The two sets of reactions are said to be ''coupled''. This means one cannot occur without the other. The flow of electrons through the electron ...hosphorylation of the 10 NADH and 2 succinate molecules made by converting one molecule of [[glucose]] to carbon dioxide and water.<ref>{{cite journal |au ...
    72 KB (10,211 words) - 02:53, 7 August 2009
View (previous 20 | ) (20 | 50 | 100 | 250 | 500)