
1) Cloning in fiction 2) Horror anthology 3) Linux game 4) Science fiction comic 5) Windows game
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https://www.crosswordclues.com/clue/dark-matter

Dark matter is a kind of matter hypothesized in astronomy and cosmology to account for gravitational effects that appear to be the result of invisible mass. Dark matter cannot be seen directly with telescopes; evidently it neither emits nor absorbs light or other electromagnetic radiation at any significant level. It is otherwise hypothesized to s...
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http://en.wikipedia.org/wiki/Dark_matter

a term used to describe matter in the universe that cannot be seen, but can be detected by its gravitational effects on other bodies.
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http://planetfacts.org/space-terms/

A form of matter which has not been directly observed but whose existence has been deduced by its gravitational effects.
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http://www.braeunig.us/space/glossary.htm

(from the article `Physical Sciences`) Since the mid-1990s astronomers had shown that the universe consists of about 4% ordinary matter (such as stars and gases in galaxies), 22% dark ... Numerous candidates for the dark matter component in the halos of galaxies and clusters of galaxies have been proposed over the years, but no ... ....
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http://www.britannica.com/eb/a-z/d/9

Contents • Discovery • Candidates • Hot or cold? • Latest research Hubble Space Telescope composite image showing what may be a ring of dark matter in the galaxy cluster Cl 0024 17. Image: NASA, ESA, M. J. Jee and H. Ford (Johns Hopkins University) Matter that can't...
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http://www.daviddarling.info/encyclopedia/D/darkmat.html

Astronomical measurements indicate that luminous matter, such as our sun, makes up only a small percentage of the total matter in the universe. The missing mass that makes up the remainder is known as dark matter.
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http://www.encyclo.co.uk/local/21425

Matter that is in space but is not visible to us because it emits no radiation by which to observe it. The motion of stars around the centers of their galaxies implies that about 90% of the matter in a typical galaxy is dark. Physicists speculate that there is also dark matter between the galaxies but this is harder to verify.
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http://www.encyclo.co.uk/visitor-contributions.php

A term used to describe matter in the universe that cannot be seen, but can be detected by its gravitational effects on other bodies.
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http://www.seasky.org/astronomy/astronomy-glossary.html

[
n] - (cosmology) a hypothetical form of matter that is believed to make up 90 percent of the matter in the universe
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http://www.webdictionary.co.uk/definition.php?query=dark%20matter

Invisible matter that scientists believe makes up some 25 percent of the universe and whose presumed existence accounts for how the trajectories through of visible stars and galaxies are bent.
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https://reut.rs/2mFVpsc

Matter that is in space but is not visible to us because it emits no radiation by which to observe it. The motion of stars around the centers of their galaxies implies that about 90% of the matter in a typical galaxy is dark. Physicists speculate that there is also dark matter between the galaxies but this is harder to verify.It has been proposed t...
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https://www.encyclo.co.uk/local/20687
noun (cosmology) a hypothetical form of matter that is believed to make up 90 percent of the matter in the universe; it is invisible (does not absorb or emit light) and does not collide with atomic particles but exerts gravitational force
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https://www.encyclo.co.uk/local/20974

Hypothetical matter that, according to certain modern theories of cosmology, is thought to make up over 90% of the mass of the universe but so far remains undetected. Measurements of the mass of galaxies using modern theories showed large discrepancies in the expected values, which led scientists to the conclusion that a theoretical substance t...
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https://www.encyclo.co.uk/local/21221
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