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The sippy cup, training cup ( American English) or beaker ( British English) is a modern drinking cup designed for toddlers which prevents or reduces spills. Sippy cups, as opposed to an open cup, have a top which prevents spills, and the child drinks either through a spout or straw. Some sippy cups work by way of surface tension that prevents ...
Orbital elements are the parameters required to uniquely identify a specific orbit. In celestial mechanics these elements are considered in two-body systems using a Kepler orbit. There are many different ways to mathematically describe the same orbit, but certain schemes, each consisting of a set of six parameters, are commonly used in ...
Orbital replacement unit. Orbital replacement units (or on-orbit replaceable unit[ 1]: 21 ) ( ORUs) are key elements of the International Space Station that can be readily replaced when the unit either passes its design life or fails. ORUs are parts of the main systems and subsystems of the external elements of the ISS, none are intended to be ...
Molecular orbital diagrams are diagrams of molecular orbital (MO) energy levels, shown as short horizontal lines in the center, flanked by constituent atomic orbital (AO) energy levels for comparison, with the energy levels increasing from the bottom to the top. Lines, often dashed diagonal lines, connect MO levels with their constituent AO levels.
Astrodynamics. The orbital period (also revolution period) is the amount of time a given astronomical object takes to complete one orbit around another object. In astronomy, it usually applies to planets or asteroids orbiting the Sun, moons orbiting planets, exoplanets orbiting other stars, or binary stars.
The Space Shuttle orbiter is the spaceplane component of the Space Shuttle, a partially reusable orbital spacecraft system that was part of the discontinued Space Shuttle program. Operated from 1981 to 2011 by NASA, [ 1 ] the U.S. space agency, this vehicle could carry astronauts and payloads into low Earth orbit, perform in-space operations ...
An animation showing a low eccentricity orbit (near-circle, in red), and a high eccentricity orbit (ellipse, in purple). In celestial mechanics, an orbit (also known as orbital revolution) is the curved trajectory of an object [1] such as the trajectory of a planet around a star, or of a natural satellite around a planet, or of an artificial satellite around an object or position in space such ...
PARIS — With days to go before the Olympics begin, the heart of Paris is silent. It’s the first thing you notice when you step out of the Metro staircase and into the Paris sunshine. No horns ...
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