Meet the AAS Keynote Speakers: Sam Hale
We interview AAS 244 keynote speaker Sam Hale!
Ancient Aurorae: Assyrian and Babylonian Astrologers Recorded the Oldest-Known Solar Storms
Researchers from Osaka University find references to candidate auroral activity in ancient cuneiform tablets dating from around 660 B.C.
Astrophysical Classics: Neutral Hydrogen in the Universe, Part 3
Our special guest astrophysical classics series on Gunn & Peterson 1965 concludes with an examination — and apprehension — of the suspects responsible for reionization.
Astrophysical Classics: Neutral Hydrogen in the Universe, Part 2
Gas in the Universe went from being mostly neutral to mostly ionized as the first galaxies formed, and the signature of this process is imprinted in quasar spectra. The review of the classic paper by Gunn & Peterson continues in this second in the three-part series.
Astrophysical Classics: Neutral Hydrogen in the Universe, Part 1
This guest post, the first in a three-part series, reviews the classic article by Gunn & Peterson (1965). This paper proposed several fundamental ideas in cosmology, including using distant quasars as “flashlights” to observe the diffuse gas between galaxies.
Astrophysical Classics: Larson’s “Laws”
This paper presents three famous relations very important for understanding the inner workings of molecular clouds and star formation processes.