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Pierre Janssen and Joseph Norman Lockyer had discovered a new element on 18 August 1868 while looking at the chromosphere of the Sun, and named it helium after the Greek word for the Sun, ἥλιος (hḗlios). [9] No chemical analysis was possible at the time, but helium was later found to be a noble gas.
Hubble proved that many objects previously thought to be clouds of dust and gas and classified as "nebulae" were actually galaxies beyond the Milky Way. [4] He used the strong direct relationship between a classical Cepheid variable 's luminosity and pulsation period [ 5 ] [ 6 ] (discovered in 1908 by Henrietta Swan Leavitt [ 7 ] ) for scaling ...
After obtaining pure neon from the atmosphere, they explored its properties using an "electrical gas-discharge" tube that was similar to the tubes used for neon signs today. Georges Claude , a French engineer and inventor, presented neon tube lighting in essentially its modern form at the Paris Motor Show , December 3–18, 1910.
Xenon is a trace gas in Earth's atmosphere, occurring at a volume fraction of 87 ± 1 nL/L (parts per billion), or approximately 1 part per 11.5 million. [63] It is also found as a component of gases emitted from some mineral springs.
Krypton-85 in the atmosphere has been used to detect clandestine nuclear fuel reprocessing facilities in North Korea [47] and Pakistan. [48] Those facilities were detected in the early 2000s and were believed to be producing weapons-grade plutonium. Krypton-85 is a medium lived fission product and thus escapes from spent fuel when the cladding ...
Astronomers Found the Ancient Light Source That Literally Turned On the Universe. Darren Orf. July 11, 2024 at 10:00 AM. This Is What Flicked on the Lights of the Universe Flavio Coelho - Getty Images
Maxwell discovered that self-propagating electromagnetic waves would travel through space at a constant speed, which happened to be equal to the previously measured speed of light. From this, Maxwell concluded that light was a form of electromagnetic radiation: he first stated this result in 1862 in On Physical Lines of Force .
The discovery that GJ 1132b has an atmosphere is a key step in the search for life outside our solar system. Scientists confirm 'Earth-like' planet with atmosphere discovered 39 light-years from Earth