Noble gas discovered in 1898

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Possible Answers: XENON.

Last seen on: Wall Street Journal Crossword – Oct 2 2018 – Country Fare

Random information on the term “XENON”:

In astronomy and cosmology, baryonic dark matter is dark matter composed of baryons. Only a small proportion of the dark matter in the universe is likely to be baryonic.

As “dark matter”, baryonic dark matter is undetectable by its emitted radiation, but its presence can be inferred from gravitational effects on visible matter. This form of dark matter is composed of “baryons”, heavy subatomic particles such as protons and neutrons and combinations of these, including non-emitting ordinary atoms.

Baryonic dark matter may occur in non-luminous gas or in Massive Astrophysical Compact Halo Objects (MACHOs) – condensed objects such as black holes, neutron stars, white dwarfs, very faint stars, or non-luminous objects like planets and brown dwarfs.

The total amount of baryonic dark matter can be inferred from models of Big Bang nucleosynthesis, and observations of the cosmic microwave background. Both indicate that the amount of baryonic dark matter is much smaller than the total amount of dark matter.

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