Business

Airbus cancels Qatar Airways plane order in feud

Airbus has taken the extraordinary step of cancelling a multi-billion-dollar order of 50 planes from Qatar Airways, a major customer, in an escalating feud over the airline's grounding of A350 aircraft.

Automotive

NTSB: Require small planes to have carbon monoxide detectors

U.S. crash investigators are urging the Federal Aviation Administration to require private planes to be equipped with carbon monoxide detectors, citing deadly crashes that were attributed to poisoning by the odorless gas.

Telecom

Airlines cancel some flights after reduced 5G rollout in US

Some flights to and from the U.S. were canceled on Wednesday even after AT&T and Verizon scaled back the rollout of high-speed wireless service that could interfere with aircraft technology that measures altitude.

Business

Boeing deliveries rose in 2021 but still lag Airbus

Boeing delivered more than twice as many commercial planes in 2021 as the year earlier, but still lagged its archrival Airbus in the closely-watched industry benchmark, according to figures released Tuesday.

Business

Tale of two companies: Airbus recovers as Boeing reels

The aviation industry is slowly recovering from last year's Covid-induced downturn, but European aircraft maker Airbus is having a smoother ride than American rival Boeing, which has endured a series of crises.

Energy & Green Tech

New Zealand strait crossed for first time by electric plane

As he made history by becoming the first person to fly across New Zealand's Cook Strait in an electric plane, Gary Freedman thought it only fitting that the first thing he saw when approaching the Wellington coastline was ...

Business

Boeing sees full commercial air recovery by 2024

Boeing said Tuesday that the commercial aviation market should fully recover by 2024 from its pandemic slump, as the industry giant lifted its aerospace forecast for the next decade.

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Planet

A planet (from Greek πλανήτης, from the verb πλανώμαι planōmai I wander), is a celestial body orbiting a star or stellar remnant that is massive enough to be rounded by its own gravity, is not massive enough to cause thermonuclear fusion, and has cleared its neighbouring region of planetesimals.[a]

The term planet is ancient, with ties to history, science, myth, and religion. The planets were originally seen by many early cultures as divine, or as emissaries of the gods. Even today, many people believe in astrology, which holds that the movement of the planets affects people's lives, although such a causation is rejected by the scientific community. As scientific knowledge advanced, human perception of the planets changed, incorporating a number of disparate objects. Even now there is no uncontested definition of what a planet is. In 2006, the IAU officially adopted a resolution defining planets within the Solar System. This definition has been both praised and criticized, and remains disputed by some scientists.

The planets were thought by Ptolemy to orbit the Earth in deferent and epicycle motions. Though the idea that the planets orbited the Sun had been suggested many times, it was not until the 17th century that this view was supported by evidence from the first telescopic astronomical observations, performed by Galileo Galilei. By careful analysis of the observation data, Johannes Kepler found the planets' orbits to be not circular, but elliptical. As observational tools improved, astronomers saw that, like Earth, the planets rotated around tilted axes, and some share such features as ice-caps and seasons. Since the dawn of the Space Age, close observation by probes has found that Earth and the other planets share characteristics such as volcanism, hurricanes, tectonics, and even hydrology. Since 1992, through the discovery of hundreds of extrasolar planets (planets around other stars), scientists are beginning to understand that planets throughout the Milky Way Galaxy share characteristics in common with our own.

Planets are generally divided into two main types: large, low-density gas giants, and smaller, rocky terrestrials. Under IAU definitions, there are eight planets in the Solar System. In order from the Sun, they are the four terrestrials, Mercury, Venus, Earth, and Mars, then the four gas giants, Jupiter, Saturn, Uranus, and Neptune. The Solar System also contains at least five dwarf planets: Ceres, Pluto (originally classified as the Solar System's ninth planet), Makemake, Haumea and Eris. With the exception of Mercury, Venus, Ceres and Makemake, all of these are orbited by one or more natural satellites.

As of June 2009, there are 353 known extrasolar planets, ranging from the size of gas giants to that of terrestrial planets.

This text uses material from Wikipedia, licensed under CC BY-SA