Definition: Weightless: Having little or no weight; not feeling the effects of gravity.
Space Tragedies9 Planets in Nine DaysAstronomy 101
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Heavyweight galaxy is king
of its cluster
KEITH COOPER
ASTRONOMY NOW
Posted: 13 May 2010 ...
Weight
Just like a person's body, an airplane's weight is pulled downward toward Earth. Image Credit: NASA
the measure of the pull of gravity on an object ...
What is your weight on the Earth, in pounds?
If you were on other celestial bodies, you would weigh a different amount than you do on Earth.
The underwater tank at Johnson Space Center allows astronauts to practice procedures in an environment similar to weightlessness.
Weightlessness Simulation in an Airplane
What if the spaceship's orbit is not circular but (say) elliptic? It makes no difference. If the force of gravity at distance r is
F = mg(RE/r)2 ...
weight
the force exerted on an object due to gravity
white dwarf ...
Weight loss, in the context of medicine or health or physical fitness, is a reduction of the total body weight, due to a mean loss of fluid, body fat or adipose tissue and/or lean mass, namely bone mineral deposits, muscle, ...
Weight -- The gravitational force exerted on an object of a certain mass. The weight of mass m is mg Newtons, where g is the local acceleration due to a body's gravity.
WWW -- World-Wide Web.
...
Weight. The 'heaviness' of an object, the amount of attraction between two or more masses. Weight is often measured in Kilogrammes but the proper (SI) unit of weight is the Newton.
Weight. The size of the external force required to keep a body at rest in its frame of reference.
Weight - The gravitational force exerted on a body by the Earth (or another astronomical object)
White Dwarf - A small, dense star that is supported against gravity by the degenerate pressure of its electrons ...
Lightweight optics and sunglasses
If you compare with the data for the Hubble Space Telescope, you will notice that JWST weighs half as much and costs little more than half what Hubble cost, yet its mirror diameter is 2.5 times bigger.
total weight (without wheelbarrow handles): 192 lbs (87.2 kg)
portability: long distance - fits inside Ford Escort stationwagon with room to spare (left image below) ...
Atomic Weight
The mean atomic mass of a particular element in atomic mass units.
Atoms ...
FORMULA WEIGHT - Mass of one formula unit of a substance in atomic mass units.
FORSTERITE - Mg-rich olivine, Mg2SiO4, common in meteorites. Fe substitutes for Mg with complete substitution yielding the Fe-rich olivine, fayalite, Fe2SiO4.
Weight is simply the mass of an object multiplied by the gravitational acceleration wherever it may be.
Weight on Neutron Star
Article Page
Make sure to circle May 15 on your calendar, the night that stages a total eclipse of the Moon. The show begins a hair's-breadth after 10 p.m.
Weight, though related to mass, nonetheless differs from the latter. Weight essentially constitutes the force exerted on matter by the gravitational attraction of the Earth, and so it varies from place to place.
Weight is a measure of how heavy something is. Weight is caused by the force of pulling down upon an object. An object's weight depends on what planet or moon it's on (unlike , which is constant).
Weighted oscillator strengths. f = oscillator strength of the transition: g = statistical weight of the lower level. [H76]
G star ...
weight - (n.)
The force determined by the gravitational pull on a mass.
whistler - (n.) ...
Weightlifting at the 1896 Summer OlympicsWeightlifting at the 1896 Summer Olympics - Men's one hand liftWeightlifting at the 1896 Summer Olympics - Men's two hand lift ...
Weight limitations were certainly one reason why Apollo 11 flew with only a few pieces of scientific gear.
The weight of the ice sheets was so great that they deformed the Earth's crust and mantle. After the ice sheets melted, the ice-covered land rebounded (see Post-glacial rebound).
Lightweight are less cumbersome than heavy, but even light, hand-held binoculars will start to shake and the image will blur when your arms become tired.
Lightweight Survivable Rover (LSR)
Sample Return Rover (SRR)
Field Integrated Design and Operations (FIDO) rover
Legged Excursion Mechanical Utility Robot (LEMUR) ...
Atomic Weight Synonym for atomic mass. Atomic weight is the relative mass of an atom of the given element compared to the mass of carbon-12.
More about atomic weight...
Middle-weight group (63"100 nuclear particles)
0.00000001
Heaviest-weight group (over 100 nuclear particles) ...
ATOMIC WEIGHT
An atom's atomic weight measures the total of the mass of the protons, neutrons, and electrons. The atomic weight is roughly equal to the number of protons and neutrons.
AU Planet Distance from the Sun
(measured in AU)
Mercury ...
Cooking weights and measures
Historical weights and measures
Vedic units of time
Paper sizes ...
Thus, the weight of an object of mass m at the surface of the Earth is obtained by multiplying the mass m by the acceleration due to gravity, g, at the surface of the Earth.
How Heavy-Weight Stars Bulk Up
(Added 12/26/05) The most massive stars in our galaxy weigh as much as 100 small stars like the Sun. How do such monsters form? Do they grow rapidly by swallowing smaller protostars within crowded star-forming regions?
Mass vs. Weight
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The landed weight of the Beagle is a paltry 30kg, this includes the casing, batteries and solar panels, so is there any room left for scientific equipment?
Unbelievably the team at the open university have managed to cram this lot on board: ...
Things have weight because of the pull of gravity. Gravity is the force of attraction that exists between any two objects. The more massive the objects, or the closer together they are, the greater the force of gravity.
A small, light-weight X-ray imaging system
Scientists and engineers realize that an instrument which creates from the low-intensity we detect in space could have important applications in health care.
Take the light weight helium and have it combine with another light weight helium to produce normal helium (He4) with two protons left over . He3 + He3 He4 + H1 + H1 ...
weightlessness (NASA Thesaurus / NASA SP-7, 1965) 1. A condition in which no acceleration, whether of gravity or other force, can be detected by an observer within the system in question.
Light consists of weightless particles (that contain no mass) traveling at about 186,000 miles or 300,000 kilometers per second. These particles of light are called photons. But light also exhibits the characteristics of a wave.
As much as we curse weight on Earth, weightlessness can cause physiological problems for astronauts in orbit. Half of all astronauts suffer motion sickness in the first few days. Some vomit.
The balance between weight of the material pressing downward on a layer in a star and the pressure in that layer.
I
Infrared Cirrus ...
The alpha particle has an atomic weight of 4 and a positive charge equal in magnitude to 2 electronic charges; hence it is essentially a helium nucleus (helium atom stripped of its two planetary electrons). Compare beta particle, gamma ray.
Part of the small asterism that the Arabs knew as "the Virgins" (which incorporates the triangle below Sirius, and includes Adhara), the name literally means, from Arabic, "weight," as in heavy.
While aligning the scope to the North Star, have the weight pointing straight down also. Now... all scopes' latitude adjustment scales are not accurate, and there are always "differences" in actual latitude and the setting scale.. SO...
The column "Lawson criterion" weights these results with Ech and gives an indication of how much more difficult it is to achieve ignition with these reactions, relative to the difficulty for the D-T reaction.
Recently, however, the trend of astronomical opinion has been rather in favour of the belief that diffused matter may exist through space in sufficient quantity to cause appreciable absorption; so that the argument has no longer the weight formerly ...
We have employed these methods along with several others to determine the size of the next sunspot cycle using a technique that weights the different predictions by their reliability. [See Hathaway, Wilson, and Reichmann J. Geophys. Res.
Weight on Mercury
Weight of Mercury
Mercury Retrograde 2010
2009 Mercury Retrograde
When Was Mercury Discovered?
Who Discovered Mercury?
Who Discovered Mercury?
How Long Does it Take Mercury to Orbit the Sun?
Planet Mercury ...
Because a lens can be supported only at its edge, the weight of the lens itself produces unavoidable distortion in the shape.
Comparison of infrared and radio data shows that the mean molecular weight of the atmosphere is 28.6 atomic mass units.
Even hydrogen, the bulk of the substance of Jupiter other than some helium and traces of various ices, becomes liquid in the interior of the gas planet when the pressure exerted by the weight of the upper layers exceeds four million bars.
The battery was placed in the middle of the toolbox and slightly forward to distribute the weight evenly. (I refer to the side of the toolbox with the latches as forward.) Styrofoam was used to keep the battery from sliding.
The enormous weight of Saturn's atmosphere causes the atmospheric pressure to increase rapidly toward the interior, where the hydrogen gas condenses into a liquid.
The weight of the glass lenses, in addition to the length of the tube, limits refractors to small apertures. Refractors with apertures larger than 4 inches can be quite expensive and also quite large.
A type of telescope mounting that supports the weight of the telescope and allows it to move in two directions to locate a specific target. One axis of support is vertical (called the altitude) and allows the telescope to move up and down.
The problem is that the mirrors sag under their own weight as they point to different parts of the sky. To produce any worthwhile image the primary must be actively corrected by continuous computer control.
On Earth the terms mass and weight are often used interchangeably, but in astronomy and Newtonian physics the mass of an object is related to how much matter it contains.
Let's use the liftoff mass of the shuttle, m = 10,600 kg (weight 104,000 kg/9.8m/s2) versus the Earth's mass, M = 5.97x1024 kg. Assume the shuttle orbits at 300 km above the Earth's surface.
052 m/s2 (0.171 ft/s2) in the value of g, which leads to a variation in the weight of an object by about 0.5% depending on whether it is weighed at the equator or at one of the poles.
 See also: Time, Earth, Light, Second, Field
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