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A comparison of state-of-the-art geometric distances that serve to anchor the distance scale and their current relative uncertainties. Additional candidate (≲1 Mpc) eclipsing binary hosts to target in future are also pictured. Current EB distances to M31 and M33 rely on early-type stars and are not precise enough to be included in H0 determination (Vilardell et al. 2010; Bonanos et al. 2006), but we expect this will improve with more sensitive moderate- to high-resolution spectroscopy capable of characterizing late-type EB systems. -- astro-ph.CO

Analog Studies, Arctic / Antarctic / Alpine, Away Teams & Field Reports, Biosignatures & Paleobiology, Cryobiology, Dale Andersen's Field Reports, Exploration Gear & Tech, Extremeophiles and Extreme Environments, Habitable Zones, Icy Worlds, ROVs/Submersibles/Diving, Water/Hycean Worlds & Oceanography

Astrobiologist Dale Andersen Status Report 30 November 2012, Lake Untersee, Antarctica

by Keith CowingNovember 30, 2012January 11, 2026

Keith’s note: I spoke with Dale Andersen at Lake Untersee, Antarctica today via satphone. The dive hole has been completed and is about 3 meters deep. Valeri and Vladimir are taking water samples right now so as to characterize the microbiology profile of the water column.

Analog Studies, Arctic / Antarctic / Alpine, Away Teams & Field Reports, Dale Andersen's Field Reports, Exploration Gear & Tech, Icy Worlds

Astrobiologist Dale Andersen Status Report 29 November 2012, Lake Untersee, Antarctica

by Keith CowingNovember 29, 2012January 11, 2026

Distance vs. Stellar Mass for over 15,000 known galaxies out to 50 Mpc (Ohlson et al. 2024). Galaxies are colorcoded by their Hubble “T” Type, with early type galaxies T < 0 and late-type galaxies T > 0. The three stellar luminosity depth limits – RGB, sub-Red Clump, and sub-oMSTO – are shown as lines, corresponding to the distances where they are achievable for massive galaxies, and color-coded according to Fig. 1. The distances for these 3 depths achievable with HST and JWST are shown as dashed lines, while those achievable with HWO are shown as solid lines. The increase in galaxy diversity accessible from JWST→HWO is striking. The color bimodality of galaxies (e.g., Baldry et al. 2004) is visible within HWO’s reach, as is the Virgo Cluster which is notable as a vertical line of enhanced density. -- astro-ph.GA

Analog Studies, Arctic / Antarctic / Alpine, Away Teams & Field Reports, Biosignatures & Paleobiology, Cryobiology, Dale Andersen's Field Reports, Exploration Gear & Tech, Extremeophiles and Extreme Environments, Habitable Zones, Icy Worlds, ROVs/Submersibles/Diving, Water/Hycean Worlds & Oceanography

Astrobiologist Dale Andersen Status Report 25 November 2012, Lake Untersee, Antarctica

by Keith CowingNovember 25, 2012January 11, 2026

The color shows the product of the radiation flux at a wavelength of 3 µm and the square of the distance for the case of a prograde fall of the planet onto the disk. Model parameters: q = 5 AU, ω = 90◦ , i = 10◦ . The time moment t = 200 years from the beginning of the calculations is shown on the left, t = 290 years is shown in the center, and t = 500 years is shown on the right. The upper graphs correspond to the direction of the line of sight against the z axis, and the lower ones along the y axis. -- astro-ph.EP

Analog Studies, Arctic / Antarctic / Alpine, Away Teams & Field Reports, Biosignatures & Paleobiology, Cryobiology, Dale Andersen's Field Reports, Exploration Gear & Tech, Extremeophiles and Extreme Environments, Habitable Zones, Icy Worlds, Microbiology & Virology, ROVs/Submersibles/Diving, Water/Hycean Worlds & Oceanography

Astrobiologist Dale Andersen Status Report 24 November 2012, Lake Untersee, Antarctica

by Keith CowingNovember 24, 2012January 11, 2026

Analog Studies, Arctic / Antarctic / Alpine, Away Teams & Field Reports, Dale Andersen's Field Reports, Exploration Gear & Tech, Extremeophiles and Extreme Environments, Icy Worlds, Robotics/Rovers/UAVs, ROVs/Submersibles/Diving, Tricorders & Sensors, Water/Hycean Worlds & Oceanography

Astrobiologist Dale Andersen Status Report 21 November 2012, Novolazarevskaya Station, Antarctica

by Keith CowingNovember 21, 2012January 11, 2026

Oops a primordial black hole just wen through me. Grok via astrobiology.com

Analog Studies, Arctic / Antarctic / Alpine, Away Teams & Field Reports, Dale Andersen's Field Reports, Icy Worlds, Imaging & Spectroscopy

Astrobiologist Dale Andersen’s Field Reports: Lake Untersee, Antarctica (Gigapixel Panorama) 7 March 2012

by Keith CowingMarch 7, 2012January 11, 2026

Away Teams & Field Reports, Dale Andersen's Field Reports

Field Report from Dale Andersen 20 June 2006

by Keith CowingJune 20, 2006January 11, 2026

Planet-hosting Triple Star System -- NASA

Analog Studies, Arctic / Antarctic / Alpine, Away Teams & Field Reports, Biosignatures & Paleobiology, Cryobiology, Dale Andersen's Field Reports, Exploration Gear & Tech, Extremeophiles and Extreme Environments, Fossils & Paleontology, Habitable Zones, Icy Worlds, Microgravity

Dale Andersen’s 1996 Antarctic Field Research Photo Album Volume 1

by Keith CowingDecember 20, 1996January 11, 2026