Latest Celestial mechanics Stories
Astronomers discovered that the HAT-P-7 planetary system includes at least two giant planets and one companion star.
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.
Planetary scientists claim in a paper published in Icarus that Saturn's moons may have formed due to giant impacts.
Astronomers from UCLA using NASA's Kepler space telescope have determined that most planetary systems are "flatter than pancakes."
Researchers have confirmed the emission of gravitational waves from the second strongest known source in our galaxy by studying the shrinking orbital period of a unique pair of burned-out stars.
Researchers working on NASA's Kepler Mission have discovered an unlikely pair of planets -- one similar to our planet, and the other roughly the size of Neptune -- locked in a surprisingly close orbit around a distant star located more than a thousand light years from Earth.
Wednesday June 20, 2012 is the longest day of the year; the one day with more sunlight hours than any other day in the calendar year; it is also the first day of summer and is known as the Summer Solstice.
The work of a University of Tennessee, Knoxville, professor has helped reveal a rare orbital shift and the density of an asteroid that will pass close to Earth.
On Tuesday evening, residences and onlookers in Manhattan will be treated to a sunset spectacle known as Manhattanhenge.
More than a 150 years ago, before Neptune was ever sighted in the night sky, French mathematician Urbain Le Verrier predicted the planet's existence based on small deviations in the motion of Uranus.
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...
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 23Â° 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...
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...
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...
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...
- A morbid dread of being buried alive. Also spelled 'taphiphobia'.
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