Sky

The sky (or celestial dome) is everything that lies above the surface of the Earth, including the atmosphere and outer space.

In the field of astronomy, the sky is also called the celestial sphere. This is viewed from Earth's surface as an imaginary dome where the sun, stars, planets, and the moon are seen to be traveling. The celestial sphere is conventionally divided into regions called constellations. Usually, the term sky is used informally as the point of view from the Earth's surface; however, the meaning and usage can vary. In some cases, such as in discussing the weather, the sky refers to only the lower, more dense portions of the atmosphere.

During daylight, the sky appears to be blue because air scatters blue sunlight more than it scatters red. At night, the sky appears to be a mostly dark surface or region scattered with stars. During the day, the Sun can be seen in the sky unless obscured by clouds. In the night sky (and to some extent during the day) the moon, planets and stars are visible in the sky. Some of the natural phenomena seen in the sky are clouds, rainbows, and aurorae. Lightning and precipitation can also be seen in the sky during storms. Birds, insects, aircraft, and kites are often considered to fly in the sky. Due to human activities, smog during the day and light pollution during the night are often seen above large cities.

TheSky (astronomy software)

TheSky is an astronomy application designed to be used for educational, observational purposes. TheSky provides an extensive feature set including the following:

Jet Propulsion Laboratory

The Jet Propulsion Laboratory (JPL) is a federally funded research and development center and NASA field center located in La Cañada Flintridge, California and Pasadena, California, United States.

The JPL is managed by the nearby California Institute of Technology (Caltech) for NASA. The laboratory's primary function is the construction and operation of planetary robotic spacecraft, though it also conducts Earth-orbit and astronomy missions. It is also responsible for operating NASA's Deep Space Network.

Among the laboratory's current major active projects are the Mars Science Laboratory mission (which includes the Curiosity rover), the Cassini–Huygens mission orbiting Saturn, the Mars Exploration Rover Opportunity, the Mars Reconnaissance Orbiter, the Dawn mission to the dwarf planet Ceres and asteroid Vesta, the Juno spacecraft en route to Jupiter, the NuSTAR X-ray telescope, and the Spitzer Space Telescope. They are also responsible for managing the JPL Small-Body Database, and provides physical data and lists of publications for all known small Solar System bodies.

JPL (Integrated Communications, Inc.)

JPL (JPL Integrated Communications, Inc.) is a strategic, integrated communications company, based in Harrisburg, Pennsylvania. The company creates communications solutions for businesses and organizations, offering services such as: branding, marketing, meeting and event production and coordination,web development,video production, and Learning Solutions.

History

JPL (formerly JPL Video Productions and then JPL Productions) was established in 1989 when co-founders Michael Horgan and Christian Masters purchased the Video Productions Department from J.P. Lilley in Harrisburg. They formed a new company called “JPL Video Productions.� At first, there were only three employees, but by 1993, the company had signed on its 15th employee and relocated to a new facility, complete with a production studio, three studio-configured cameras, a cyclorama, and a control room. In 1995, JPL established the “Interactive Technologies Group.�

In 2000, they merged with York-based production company, Kennedy/Lee, and brought on board three experienced video professionals. When web development company MarginPoint joined JPL in 2002, the company added web application development and e-Marketing to its list of services. That same year, JPL was named one of the Best Places to Work in Pennsylvania by the Central Penn Business Journal -–an honor they would receive for the next seven years, distinguishing JPL as one of only six companies across the state to win the award that many consecutive years.

JPL (cyclecar)

The JPL was a cyclecar built in Detroit, Michigan by the J.P.L. Cyclecar Company in 1913. The JPL was designed by J.P. La Vigne who was an early and ubiquitous engineer in the industry. The cyclecar was equipped with a four-cylinder air-cooled engine with a sliding-gear transmission. The vehicle was claimed to get 30 mpg_-US (7.8 L/100 km; 36 mpg_-imp)-40 mpg_-US (5.9 L/100 km; 48 mpg_-imp), and have a top speed of 50 mph (80 km/h).

References

Paint

Paint is any liquid, liquefiable, or mastic composition that, after application to a substrate in a thin layer, converts to a solid film. It is most commonly used to protect, color, or provide texture to objects. Paint can be made or purchased in many colors—and in many different types, such as watercolor, synthetic, etc. Paint is typically stored, sold, and applied as a liquid, but most types dry into a solid.

History

In 2011, South African archeologists reported finding a 100,000-year-old human-made ochre-based mixture that could have been used like paint.Cave paintings drawn with red or yellow ochre, hematite, manganese oxide, and charcoal may have been made by early Homo sapiens as long as 40,000 years ago.

Ancient colored walls at Dendera, Egypt, which were exposed for years to the elements, still possess their brilliant color, as vivid as when they were painted about 2,000 years ago. The Egyptians mixed their colors with a gummy substance, and applied them separately from each other without any blending or mixture. They appear to have used six colors: white, black, blue, red, yellow, and green. They first covered the area entirely with white, then traced the design in black, leaving out the lights of the ground color. They used minium for red, and generally of a dark tinge.

Paint (disambiguation)

Paint is a pigmented liquid or paste used to apply color to a surface, often by artists.

Paint may also refer to:

Places

Art and entertainment

Technology

Other uses