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Latest Celestial mechanics Stories

Elephant’s Tomb May Have Originally Been Mithras Temple
2013-05-11 08:39:41

April Flowers for redOrbit.com — Your Universe Online In the Roman necropolis of Carmona in Seville, Spain, there is a structure known as the Elephant´s Tomb. A new study from the University of Pablo de Olavide reveals the structure was not always used for burials. They suggest the original structure, and a window through which the sun shines directly during the equinoxes, indicate the Elephant´s Tomb was a temple of Mithraism, an unofficial religion in the Roman Empire....

Cosmic Test Upholds Einstein's Theory Of General Relativity
2013-04-25 13:56:53

Lee Rannals for redOrbit.com — Your Universe Online Astronomers have found a way to test Einstein's theory of gravity in ways that were not possible before now, thanks to new observations of a very unique system. A team used telescopes around the world to study the most massive neutron star confirmed so far, orbited by a white dwarf. The scientists wrote in the journal Science that so far the new observations match up with Einstein's predictions for general relativity....

Improving The Mathematical Method For Simulating Solar System Evolution
2013-04-12 04:57:04

John P. Millis, Ph.D. for redOrbit.com — Your Universe Online It seemed that that we had everything worked out. Astronomers modeled the creation and evolution as the collapse of a giant solar nebula. As the central star formed, the radiation then influenced the formation of the planets — rocky planets dominating the inner sanctum, while the larger gas giants naturally populated the orbits further out. All of this was then encased in a spherical swarm of icy bodies known as...

MOND Theory Predict Key Property In Andromeda's Satellites
2013-02-15 11:58:01

April Flowers for redOrbit.com - Your Universe Online A research collaboration between Case Western University and Weizmann Institute of Science has used modified laws of gravity to closely predict a key property measured in faint dwarf galaxies that are satellites of the nearby giant spiral galaxy Andromeda. The study centers around the property of velocity dispersion, which is the average velocity of objects within a galaxy relative to each other. Velocity dispersion is by used...

OSIRIS-Rex To Study Asteroid Yarkovsky Effect
2013-02-08 18:46:31

Lee Rannals for redOrbit.com — Your Universe Online NASA will be launching a new mission in 2016 to help estimate what kind of impact an asteroid would make if it struck Earth. The OSIRIS-REx (Origins, Spectral Interpretation, Resource Identification, Security, and Regolith Explorer) mission will travel to a potentially hazardous asteroid (PHA), and make measurements of the Yarkovsky effect. This effect is a push on an asteroid that happens when it is warmed up by the sun and...

Two Giant Planets, Companion Star Discovered In Known Planetary System
2013-01-25 09:56:36

Lee Rannals for redOrbit.com — Your Universe Online Astronomers discovered that the HAT-P-7 planetary system includes at least two giant planets and one companion star. The discovery of a previously unknown companion, HAT-P-7B, to the central star, HAT-P-7, as well as confirmation of another giant planet, HAT-P-7c, orbiting outside of the retrograde planet HAT-P-7b offers up new insights into how such planets may form. Astronomers used the Subaru Telescope to discover the first...

Binary Star Orbit Shifts Could Force Planetary Ejections
2013-01-07 03:28:35

redOrbit Staff & Wire Reports - Your Universe Online The orbits of distant binary stars can become altered over time, potentially causing violent disruptions in their planetary systems and possibly causing worlds to become scattered or ejected, an international team of astrophysicists has discovered in a new study. According to the researchers, all planetary systems in which one star is orbited by a second, companion star, can be altered by the gravity of the companion star, but...

Giant Impacts Formed The Moons Of Saturn
2012-10-17 14:58:59

Lee Rannals for redOrbit.com — Your Universe Online Planetary scientists claim in a paper published in Icarus that Saturn's moons may have formed due to giant impacts. Erik Asphaug, professor of Earth and Planetary Sciences at the University of California, Santa Cruz (UCSC), presented the new model at the annual meeting of the Division for Planetary Sciences of the American Astronomical Society (AAS). Asphaug and co-author Andreas Reufer of the University of Bern found that...

Planetary Systems Compared To Pancakes
2012-10-15 12:14:06

Lee Rannals for redOrbit.com - Your Universe Online Astronomers from UCLA using NASA's Kepler space telescope have determined that most planetary systems are "flatter than pancakes." The team wrote in a paper submitted to the Astrophysical Journal that they developed a computer model of planetary systems and compared them to the properties of Kepler data. They found that the more than 85 percent of planets have inclinations of less than three degrees, making the planetary systems...


Latest Celestial mechanics Reference Libraries

Earth Day
2012-04-23 12:12:49

Earth Day is a day early each year on which events are held to increase awareness and appreciation of the Earth’s natural environment. It is now coordinated worldwide through the Earth Day Network, founded by Dennis Hayes, and is celebrated in more than 175 countries every year. The United Nations designated April 22 as International Mother Earth Day in 2009, and will continue to be held each year on April 22 through at least 2015. The name and concept of Earth Day was allegedly...

0_526999cd53385fe59877aee7aa5d6eb7
2011-06-20 11:32:36

The Summer Solstice, or "Midsummer," derived from the Latin sol (sun) and sistere (to stand still), occurs exactly when the Earth's axial tilt is most inclined towards the sun at its maximum of 23° 26'. This is the time when the Sun is at its highest, or most northerly, point in the sky in the Northern Hemisphere. Except in the polar regions, where daylight is continuous for many months during the spring and summer, the day on which the Summer solstice occurs is the day of the year with...

45_b90d45a4e7d89d873d39705549e516ce
2014-01-12 00:00:00

Sample Entry: Astronomy is the scientific study of stars, planets, comets, galaxies, and other phenomena that occur outside Earth's atmosphere (e.g. cosmic radiation). Astronomy deals with the evolution, physics, chemical makeup, meteorology, and motion of celestial objects, and also the formation of the universe. The word Astronomy comes from the Greek words astron (meaning "star") and nomos (meaning "law"). Astronomy is one of the oldest sciences. Since the dawn of man, people always...

22_438736ec75b9bfaca9b25a90d91dcfaa2
2004-10-19 04:45:44

Autumnal Equinox -- In astronomy, is the equinox at the beginning of autumn in the northern hemisphere: the moment when the sun appears to cross the celestial equator, heading southward. The equinox occurs around September 22-24, varying slightly each year according to the 400 year cycle of leap years in the Gregorian Calendar. In the southern hemisphere, the equinox occurs at the same moment, but at the beginning of spring. There are two conventions for dealing with this: either the...

9_4e0ee555c18ad7f31f4e1417f556ae6a2
2004-10-19 04:45:44

Satellite -- A satellite is an object that orbits another object. With sufficient tangential velocity, the object does not collide with the primary object it orbits, but maintains a distance from that object as the rate at which it falls towards that object is similar to the rate that it travels away, thus the object orbits the primary object and becomes a satellite. In other words: gravitational force serves as the centripetal force needed to make the object circle the primary...

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Word of the Day
lunula
  • A small crescent-shaped structure or marking, especially the white area at the base of a fingernail that resembles a half-moon.
This word is a diminutive of the Latin 'luna,' moon.
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