Quantcast

Latest Celestial mechanics Stories

2010-01-26 17:47:00

PERTH, Australia, Jan.

fd933bbecd86e14806de5e38c39bccac1
2009-10-16 08:45:00

Direct communication between Earth and Mars can be strongly disturbed and even blocked by the Sun for weeks at a time, cutting off any future human mission to the Red Planet.

2009-08-25 07:00:00

EAGAN, Minn., Aug. 25 /PRNewswire/ -- ORBIT Systems, Inc.

2009-07-23 10:41:13

The study shows that the comets were probably captured 600 million years after the formation of the solar system, during the Late Heavy Bombardment

8e6a077bdfcb360d5261d689553cc9521
2009-06-05 09:45:00

Beginning today, ESA's Planck satellite will carry out a critical mid-course maneuver that will place the satellite on its final trajectory for arrival at L2, the second Lagrange point of the Sun-Earth system, early in July.

7773eefee358411801e8926cc55848611
2009-05-26 14:40:13

ESA's gravity mission GOCE has achieved a first in the history of satellite technology.

2009-05-21 14:06:58

The European Space Agency says the commissioning of scientific instruments and subsystems aboard its Herschel and Planck spacecraft has started. The two space observatories were lifted into orbit aboard an Ariane 5 rocket last week from the French spaceport at Kourou, French Guiana.

2009-05-14 09:13:22

The European Space Agency's Herschel and Planck satellites went into space Thursday aboard an Ariane 5 rocket from the French spaceport in French Guiana. The dual space telescopes were headed toward a spot called L2 -- the second Lagrange point -- where they will operate in different orbits. L2 is a local gravitational point that is fixed in the Earth-sun system and is situated on Earth's night side, the ESA said.

1505eb9b170b735c7a8839b6ec78d0a8
2009-05-06 07:20:00

New insights into Milky Way satellite galaxies raise awkward questions for cosmologists.

3885fa237ba55db1facd73822a066a541
2009-04-22 08:20:10

The high speed of stars and apparent presence of ‘dark matter’ in the satellite galaxies that orbit our Milky Way Galaxy presents a direct challenge to Newton’s theory of gravitation, according to physicists from Germany, Austria and Australia.


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...

More Articles (18 articles) »
Word of the Day
zill
  • One of a pair of round metal cymbals attached to the fingers and struck together for rhythm and percussion in belly dancing.
The word 'zill' comes from a Turkish word meaning "cymbals".
Related