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The first molecule detected in the interstellar medium was the methylidyne radical (CH •) in 1937, through its strong electronic transition at 4300 angstroms (in the optical). [4] Advances in astronomical instrumentation have led to increasing numbers of new detections.
PG5 has a molecular mass of about 200 MDa or 200,000,000,000,000,000 g/mol. It has roughly 200 million atoms and a diameter of roughly 10 nm. Its length is up to a few micrometers. [3]
A circumstellar disc (or circumstellar disk) is a torus, pancake or ring-shaped accretion disk of matter composed of gas, dust, planetesimals, asteroids, or collision fragments in orbit around a star. Around the youngest stars, they are the reservoirs of material out of which planets may form.
Astronomers have discovered what they believe is the biggest known batch of planet-making ingredients swirling around a young star. The diameter of this colossal disk is roughly 3,300 times the ...
The disc is around a young massive star forming in a stellar nursery called N180. It is within the Larg Magellanic Cloud, a dwarf galaxy that neighbours ours. Scientists caught that difference in ...
Circumplanetary disk around exoplanet PDS 70c (point-like source on the right side). A circumplanetary disk (or circumplanetary disc, short CPD) is a torus, pancake or ring-shaped accumulation of matter composed of gas, dust, planetesimals, asteroids or collision fragments in orbit around a planet.
A protoplanetary disk is a rotating circumstellar disc of dense gas and dust surrounding a young newly formed star, a T Tauri star, or Herbig Ae/Be star. The protoplanetary disk may not be considered an accretion disk; while the two are similar, an accretion disk is hotter and spins much faster. It is also found on black holes, not stars. This ...
The Sculptor Galaxy (NGC 253) is an example of a disc galaxy. A galactic disc (or galactic disk) is a component of disc galaxies, such as spiral galaxies like the Milky Way and lenticular galaxies. Galactic discs consist of a stellar component (composed of most of the galaxy's stars) and a gaseous component (mostly composed of cool gas and dust).