Planet

A planet (from Ancient Greek ἀστήρ πλανήτης astēr planētēs, or πλάνης ἀστήρ plánēs astēr, meaning "wandering star") is an astronomical object 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.

The term planet is ancient, with ties to history, science, mythology, and religion. Several planets in the Solar System can be seen with the naked eye. These were regarded by many early cultures as divine, or as emissaries of deities. As scientific knowledge advanced, human perception of the planets changed, incorporating a number of disparate objects. In 2006, the International Astronomical Union (IAU) officially adopted a resolution defining planets within the Solar System. This definition is controversial because it excludes many objects of planetary mass based on where or what they orbit. Although eight of the planetary bodies discovered before 1950 remain "planets" under the modern definition, some celestial bodies, such as Ceres, Pallas, Juno and Vesta (each an object in the solar asteroid belt), and Pluto (the first trans-Neptunian object discovered), that were once considered planets by the scientific community, are no longer viewed as such.

Solar System

The Solar System is the gravitationally bound system comprising the Sun and the objects that orbit it, either directly or indirectly. Of those objects that orbit the Sun directly, the largest eight are the planets, with the remainder being significantly smaller objects, such as dwarf planets and small Solar System bodies. Of the objects that orbit the Sun indirectly, the moons, two are larger than the smallest planet, Mercury.

The Solar System formed 4.6 billion years ago from the gravitational collapse of a giant interstellar molecular cloud. The vast majority of the system's mass is in the Sun, with most of the remaining mass contained in Jupiter. The four smaller inner planets, Mercury, Venus, Earth and Mars, are terrestrial planets, being primarily composed of rock and metal. The four outer planets are giant planets, being substantially more massive than the terrestrials. The two largest, Jupiter and Saturn, are gas giants, being composed mainly of hydrogen and helium; the two outermost planets, Uranus and Neptune, are ice giants, being composed mostly of substances with relatively high melting points compared with hydrogen and helium, called ices, such as water, ammonia and methane. All planets have almost circular orbits that lie within a nearly flat disc called the ecliptic.

I Am

I Am may refer to:

Music

Albums

I Am... (Ayumi Hamasaki album), 2002

I Am (Becoming the Archetype album), 2012

I Am... Sasha Fierce, by Beyoncé Knowles

I Am (Chrisette Michele album), 2007

I Am (Earth, Wind & Fire album), 1979

I Am (Elisa Fiorillo album), 1990

I Am (Leona Lewis album), 2015

I Am (Mao Denda album), 2009

I Am (Michael Tolcher album), 2004

I Am (Monrose album), 2008

I Am… (Nas album), 1999

I Am (Future Black President) The EP, by Novel

I Am (Pete Townshend album), 1972

I Am, an album by Scout Niblett

I Am (Texas in July album), 2009

I Am (Yo Gotti album), 2013

Songs

"I Am" (Awolnation song), 2015

"I Am" (Crowder song), 2013

"I Am" (Kid Rock song), 2004

"I Am" (Killing Heidi song), 2004

"I Am" (Leona Lewis song), 2015

"I Am" (Mark Schultz song), 2006

"I Am" (Mary J. Blige song), 2009

"I Am" (Train song), 1996

"I Am", by Army of Lovers

"I AM", by Axwell and Sick Individuals featuring Taylr Renee, 2013

"I Am", by Bon Jovi from Have a Nice Day

"I Am", by Christina Aguilera from Bionic

And I

"And I" is a song written by American R&B singer Ciara, and produced by Adonis Shropshire for Ciara's first album, Goodies (2004). It was released as the album's fourth and final single on August 30, 2005 (see 2005 in music) in North America.

The song was originally the third choice for the fourth single. Ciara has mentioned in an interview that "Thug Style", "Hotline" or "Pick up the Phone" would be the fourth single, but when Ciara suggested "And I" to executives at her previous record label LaFace, they were unhappy because they wanted "Next to You" to be the fourth single.

Chart performance

At the time of the U.S. release of "And I", Ciara's collaboration with Bow Wow, "Like You", and her collaboration with Missy Elliott, "Lose Control", were at the height of their popularity. "And I" peaked at 96 on the U.S. Billboard Hot 100 and 27 on Billboard's Hot R&B/Hip-Hop Singles & Tracks chart, which were poor positions compared to those attained by the first three singles from the album Goodies. It was not released outside North America because of this, and it is Ciara's least successful single.

Space observatory

A space observatory is any instrument (such as a telescope) in outer space that is used for observation of distant planets, galaxies and other outer space objects. The first such space observatory was the Hubble Space Telescope launched in 1990. Space observatories avoid many of the problems of ground observatories, such as light pollution and the filtering and distortion of electromagnetic radiation (scintillation).

This category is distinct from other observatories located in space that are pointed toward Earth for the purpose of reconnaissance and other types of information gathering.

History

In 1946, American theoretical astrophysicist Lyman Spitzer was the first to conceive the idea of a telescope in outer space, a decade before the Soviet Union launched the first satellite, Sputnik 1.

Spitzer's proposal called for a large telescope that would not be hindered by Earth's atmosphere. After lobbying in the 1960s and 70s for such a system to be built, Spitzer's vision ultimately materialized into the Hubble Space Telescope, which was launched on April 24, 1990 by the Space Shuttle Discovery (STS-31).

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Planets

The lights are frozen, see them spinning 'round my head.
Planets turning, but whose to say they're really there?
Because illusions serve to trick my mind and I just wanna go out tonight.
Hate the thought of being here alone.
But there's nothing going on down the streets, now the bars have all shut down.
The Suego Faults is just a dream that I'm waking up from now.
And I'd love to watch you spin around, but I'm running out of time.
The skies been playing with colossal fires,
But I can't escape the feeling of while I'm looking left, looking right,
There's something missing out there tonight!
I never seem to find what I desire.
So I'll spill out under the frozen lights, and I'll watch them until I'm drunk.
And if tomorrow the sun should rise, a new day has begun.
But I spend my whole life spinning around and never moving on.
Come on, fighter, here's what I'm telling you.
A Dreamer, love songs; it's all you'll ever do.
So fight on, you'll survive it.
You'll go spinning on your own.
Come on, fighter.
Here's what I'm telling you.
A Dreamer, love songs; it's all you'll ever do.
So fight on, you'll survive it.

photo: AP / Wong Maye-E

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How cult French comic Valérian and Laureline was Star Wars before Star Wars

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Planet

Solar System

I Am

Music

Albums

Songs

And I

Chart performance

Space observatory

History

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Planets