2015 in science and Comet nucleus

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Difference between 2015 in science and Comet nucleus

2015 in science vs. Comet nucleus

A number of significant scientific events occurred in 2015. The nucleus is the solid, central part of a comet, popularly termed a dirty snowball or an icy dirtball.

Acetamide

Acetamide (systematic name: ethanamide) is an organic compound with the formula CH3CONH2.

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Acetone

Acetone (systematically named propanone) is the organic compound with the formula (CH3)2CO.

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Astronomy & Astrophysics

Astronomy & Astrophysics is a peer-reviewed scientific journal covering theoretical, observational, and instrumental astronomy and astrophysics.

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Atmosphere

An atmosphere is a layer or a set of layers of gases surrounding a planet or other material body, that is held in place by the gravity of that body.

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Carbon dioxide

Carbon dioxide (chemical formula) is a colorless gas with a density about 60% higher than that of dry air.

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Coma (cometary)

The coma is the nebulous envelope around the nucleus of a comet, formed when the comet passes close to the Sun on its highly elliptical orbit; as the comet warms, parts of it sublime.

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Comet

A comet is an icy small Solar System body that, when passing close to the Sun, warms and begins to release gases, a process called outgassing.

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Electron

The electron is a subatomic particle, symbol or, whose electric charge is negative one elementary charge.

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European Space Agency

The European Space Agency (ESA; Agence spatiale européenne, ASE; Europäische Weltraumorganisation) is an intergovernmental organisation of 22 member states dedicated to the exploration of space.

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Hydrogen

Hydrogen is a chemical element with symbol H and atomic number 1.

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Methyl isocyanate

Methyl isocyanate (MIC) is an organic compound with the molecular formula CH3NCO.

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Molecule

A molecule is an electrically neutral group of two or more atoms held together by chemical bonds.

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NASA

The National Aeronautics and Space Administration (NASA) is an independent agency of the executive branch of the United States federal government responsible for the civilian space program, as well as aeronautics and aerospace research.

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Nature (journal)

Nature is a British multidisciplinary scientific journal, first published on 4 November 1869.

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Near-Earth object

A near-Earth object (NEO) is any small Solar System body whose orbit can bring it into proximity with Earth.

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Nebular hypothesis

The nebular hypothesis is the most widely accepted model in the field of cosmogony to explain the formation and evolution of the Solar System (as well as other planetary systems).

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Organic compound

In chemistry, an organic compound is generally any chemical compound that contains carbon.

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Philae (spacecraft)

Philae is a robotic European Space Agency lander that accompanied the ''Rosetta'' spacecraft until it separated to land on comet 67P/Churyumov–Gerasimenko, ten years and eight months after departing Earth.

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Photoionization

Photoionization is the physical process in which an ion is formed from the interaction of a photon with an atom or molecule.

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Photon

The photon is a type of elementary particle, the quantum of the electromagnetic field including electromagnetic radiation such as light, and the force carrier for the electromagnetic force (even when static via virtual particles).

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Planetesimal

Planetesimals are solid objects thought to exist in protoplanetary disks and in debris disks.

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Porosity

Porosity or void fraction is a measure of the void (i.e. "empty") spaces in a material, and is a fraction of the volume of voids over the total volume, between 0 and 1, or as a percentage between 0% and 100%.

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Propionaldehyde

Propionaldehyde or propanal is the organic compound with the formula CH3CH2CHO.

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Rosetta (spacecraft)

Rosetta was a space probe built by the European Space Agency launched on 2 March 2004.

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Saturn

Saturn is the sixth planet from the Sun and the second-largest in the Solar System, after Jupiter.

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Science (journal)

Science, also widely referred to as Science Magazine, is the peer-reviewed academic journal of the American Association for the Advancement of Science (AAAS) and one of the world's top academic journals.

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Solar wind

The solar wind is a stream of charged particles released from the upper atmosphere of the Sun, called the corona.

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Spacecraft

A spacecraft is a vehicle or machine designed to fly in outer space.

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Sun

The Sun is the star at the center of the Solar System.

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Sunlight

Sunlight is a portion of the electromagnetic radiation given off by the Sun, in particular infrared, visible, and ultraviolet light.

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Water

Water is a transparent, tasteless, odorless, and nearly colorless chemical substance that is the main constituent of Earth's streams, lakes, and oceans, and the fluids of most living organisms.

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67P/Churyumov–Gerasimenko

67P/Churyumov–Gerasimenko (abbreviated as 67P or 67P/C-G) is a Jupiter-family comet, originally from the Kuiper belt, with a current orbital period of 6.45 years, a rotation period of approximately 12.4 hours and a maximum velocity of.

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