Micrometeoroids In 1946, during the Giacobinid meteor shower, Helmut Landsberg collected several small magnetic particles that were apparently associated with the shower. Fred Whipple was intrigued by ...
The three collinear Lagrange points (L1, L2, L3) were discovered by Leonhard Euler a few years before Lagrange discovered the remaining two.In 1772, Joseph Louis Lagrange published an "Essay on the th ...
WISE, a space telescope launched into Earth orbit in December 2009, imaged 2010 TK7 in October 2010 while carrying out a program to scan the entire sky from January 2010 to February 2011. Spotting an ...
In astronomy, a trojan is a minor planet or natural satellite (moon) that shares an orbit with a planet or larger moon, but does not collide with it because it orbits around one of the two Lagrangian ...
Shortly after the discovery by LINEAR, Scientists at the Jet Propulsion Laboratory (JPL), the Athabasca University (Canada), the Queen’s University in Kingston (Ontario, Canada), the York University ...
Cruithne was discovered on October 10, 1986, by Duncan Waldron on a photographic plate taken with the UK Schmidt Telescope at Siding Spring Observatory, Coonabarabran, Australia. The 1983 apparition ( ...
As of 2012, Earth has several known quasi-satellites: (164207) 2004 GU9, (277810) 2006 FV35 and 2010 SO16.3753 Cruithne, 2002 AA29, and 2003 YN107 are minor planets in a horseshoe orbit that can trans ...
An object's solid angle in steradians is equal to the area of the segment of a unit sphere, centered at the angle's vertex, that the object covers. A solid angle in steradians equals the area of a seg ...
The angular diameter of a circle whose plane is normal the displacement vector between the point of view and the centre of said circle can be calculated using the formula:\delta = 2 \arctan \left( \tf ...
This article follows US physics terminology by using the word torque. In the UK and in US mechanical engineering, this is called moment of force, usually shortened to moment. In US mechanical engineer ...
The simplest definition is "the study of ancient life". Paleontology seeks information about several aspects of past organisms: "their identity and origin, their environment and evolution, and what th ...
The simplest definition is "the study of ancient life". Paleontology seeks information about several aspects of past organisms: "their identity and origin, their environment and evolution, and what th ...
A now dry barrier reef, located in present day Kimberley Basin of northwest Australia, once extended a thousand kilometers, fringing a Devonian continent. Reefs in general are built by various carbona ...
On Earth, the terminator is a circular line with a diameter that is approximately that of the Earth. The terminator passes through any point on the Earth's surface twice a day, once at sunrise and onc ...
The change in rotation rate necessary to tidally lock a body B to a larger body A is caused by the torque applied by A's gravity on bulges it has induced on B by tidal forces.Tidal bulgesA's gravity p ...
