Josh Simon

@joshsimon.bsky.social

194 Followers 128 Following

Astronomer. Opinions my own.

A screenshot of part of the Suspension and Termination Procedures for NSF grants, showing that NSF can terminate grants that "no longer effectuat[e] the program goals or agency priorities."
The end of The Atlantic article reporting a Signal chat discussing the bombing of Yemen. The paragraph reads: "All along, members of the Signal group were aware of the need for secrecy and operations security. In his text detailing aspects of the forthcoming attack on Houthi targets, Hegseth wrote to the group—which, at the time, included me—`We are currently clean on OPSEC.'”
A screen capture of the statistics from the Magellan guider camera, showing that the seeing (labeled "full width", or "fw", in the image) is 0.4 arcseconds.
Plots of the spectra of the brightest star in DELVE 1 and the brightest star in Eridanus III. Spectral regions including absorption from carbon, strontium, magnesium, and barium are shown, with very strong carbon absorption evident.
A plot of the brightness (absolute magnitude) of the Milky Way's population of star clusters and dwarf galaxies, as a function of their size (half-light radius). Bright galaxies and clusters occupy distinct regions of this parameter space, but for the faintest objects the two classes overlap so that it is no longer possible to classify a system just from its size and luminosity. Two satellites, Eridanus III and DELVE 1, which have absolute magnitudes of -2 and 0 and sizes of about 7 pc, respectively, are plotted as red diamonds.
The Department of Astrophysical Sciences building at Princeton, seen at twilight and featuring an open telescope dome on the roof.
A photo of the front of the Carnegie Observatories building in Pasadena, hung with banners illustrating the history of astronomical discoveries at Carnegie.
The twin Keck telescopes, with domes open to reveal the telescopes inside, under a colorful cloudy sky at sunset.
Carnegie astronomer Juna Kollmeier standing in front of a giant curved wall of screens displaying an astronomical simulation.
The moon, surrounded by a halo of ice crystals, over one of the Magellan telescopes.
A view of the Milky Way over the Magellan Baade telescope at Las Campanas Observatory.
Several planets and a star cluster in the evening sky over Las Campanas Observatory.
A photo of the front of the Carnegie Observatories building in Pasadena, hung with banners illustrating the history of astronomical discoveries at Carnegie.
The twin Keck telescopes, with domes open to reveal the telescopes inside, under a colorful cloudy sky at sunset.
Carnegie astronomer Juna Kollmeier standing in front of a giant curved wall of screens displaying an astronomical simulation.
The moon, surrounded by a halo of ice crystals, over one of the Magellan telescopes.
A view of the Milky Way over the Magellan Baade telescope at Las Campanas Observatory.