Latest Astrodynamics Stories
It's the year 2020, and space has never been so busy. Picture this: In Earth orbit, a robotic maintenance ship skitters from one weather satellite to another, upgrading powerful optics that help meteorologists track dangerous storms.
NASA wants to explore the Moon's polar regions for many reasons, not the least of which is that deep polar craters may contain ice. However, the instability of polar orbits poses a real problem for exploration and communication with Earth.
There is a lot of junk orbiting the Earth and the problem will worsen unless there are changes in how spacecraft operators operate. But it is not all doom and gloom. The first steps toward a comprehensive solution are already well underway including a European code of conduct for space debris mitigation.
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...
Orbit -- An orbit is the path that an object makes around another object under the influence of some force. The classical example is that of the solar system, where the Earth, other planets, asteroids, comets, and smaller pieces of rubble are in orbit around the Sun; and moons are in orbit around planets. These days, many artificial satellites are in orbit around the Earth. Understanding orbits There are a few common ways of understanding orbits. -- As the object moves, it...
Escape Velocity -- An escape velocity is the minimum speed at which an object without propulsion can move away from a source of a gravitational field indefinitely if there is no friction. This definition may need modification for the practical problem of two or more sources in some cases. In any case, the object is assumed to be a point with a mass that is negligible compared with that of the source of the field, usually an excellent approximation. It is commonly described as the speed...
- An uxorious, effeminate, or spiritless man.
- A timorous, cowardly fellow.
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