pale blue dot Archives - Astrobiology

The Pale Blue Dot is a photograph of Earth taken Feb. 14, 1990, by NASA’s Voyager 1 at a distance of 3.7 billion miles (6 billion kilometers) from the Sun. The image inspired the title of scientist Carl Sagan's book, "Pale Blue Dot: A Vision of the Human Future in Space," in which he wrote: "Look again at that dot. That's here. That's home. That's us." The above image, “Pale Blue Dot Revisited,” was created in 2020 for the 30th anniversary of the iconic picture. The updated version used modern image-processing software and techniques to revisit the well-known Voyager view, while attempting to respect the original data and intent of those who planned the images. NASA/JPL-Caltech Larger image

Imaging & Spectroscopy, Interstellar, Jupiter, Mars, Mercury, Neptune, Press Release, Uranus, Venus

Pale Blue Dot Anniversary

by Keith CowingFebruary 14, 2026February 14, 2026

The Pale Blue Dot is a photograph of Earth taken on Feb. 14, 1990, by NASA’s Voyager 1 spacecraft. Earth appears as a tiny speck of light suspended in a […]

Phase-dependent measurements of Earth’s broadband visual apparent albedo, including historic observations from Danjon (1928). Mission or observing technique is indicated by datapoint color and shape. Uncertainties are indicated, which are sometimes smaller than the point size. -- astro-ph.EP

Astronomy & Telescopes, Atmospheres, Climate, Weather, Biosignatures & Paleobiology, Exoplanets, -moons, -comets, Habitable Zones, Imaging & Spectroscopy, Status Report

Inferring And Interpreting The Visual Geometric Albedo and Phase Function of Earth

by Keith CowingAugust 2, 2025August 2, 2025

Understanding reflectance-related quantities for worlds enables effective comparative planetology and strengthens mission planning and execution.

Progression of the simulations, combining the cloud-free simulations (left most panel), with the fully cloudy simulations (panel two), to yield the simulations using the cloud fraction map (panel three). The last panel shows the DSCOVR/EPIC observation that is being reproduced. Observations and synthetic images show very similar dynamic range, absolute flux calibration and coloring. No special or arbitrary scaling or calibrations were applied to the model, nor the data. -- astro-ph.EP

AI - Data - Apps - Cybernetics, Analog Studies, Astrogeology, Atmospheres, Climate, Weather, Biosignatures & Paleobiology, Exoplanets, -moons, -comets, Habitable Zones, Imaging & Spectroscopy, Status Report

The Pale Blue Dot: Using the Planetary Spectrum Generator to Simulate Signals from Hyper Realistic Exo-Earths

by Keith CowingNovember 20, 2024November 20, 2024

The atmospheres and surfaces of planets show tremendous amount of spatial variation, which has a direct effect on the spectrum of the object, even if this may not be spatially […]

Earth's Spectrum -- NASA

Astrochemistry, Astrogeology, Astronomy & Telescopes, Atmospheres, Climate, Weather, Biosignatures & Paleobiology, Exoplanets, -moons, -comets, Habitable Zones, Imaging & Spectroscopy, Status Report

The Pale Blue Dot: Using the Planetary Spectrum Generator to Simulate Signals from Hyperrealistic Exo-Earths

by Keith CowingSeptember 24, 2024September 24, 2024

Simulating realistic observations of exoplanet atmospheres requires consideration of several physical, astronomical, and technological aspects. The composition and physical structure of an atmosphere has to be modeled using three dimensional […]

The primary calibration target for Mastcam-Z, a pair of zoomable cameras aboard NASA's Perseverance Mars rover, features color swatches used by scientists to fine-tune the cameras' settings. -- NASA/JPL-Caltech/ASU/MSSS/University of Copenhagen

Astrobiology (general), Education and Outreach, Imaging & Spectroscopy, Missions & Hardware, Societal Issues, Status Report

Astrobiology-Themed Imagery On Perseverance Mars Rover’s Mastcam-Z Calibration Target

by Keith CowingJuly 29, 2024July 29, 2024

The primary calibration target for Mastcam-Z, a pair of zoomable cameras aboard NASA’s Perseverance Mars rover, features color swatches used by scientists to fine-tune the cameras’ settings.

Color–color plot from the 1990 Galileo encounter with Earth showing brightness ratios in the RED/VIOLET and IR-6560/VIOLET SSI filters. The colorbar on the right indicates sxub-spacecraft west longitude, with important features marked along that colorbar. Larger values along either axis indicate redder colors. The overall color of Earth changes in a cyclical fashion as it rotates underneath the spacecraft. The strongest redward deviation occurs when the Sahara and Amazon rainforest were in view while the strongest blueward deviation occurs when the Pacific Ocean is in view. -- astro-ph.EP

Analog Studies, Biosignatures & Paleobiology, Exoplanets, -moons, -comets, Habitable Zones, Icy Worlds, Imaging & Spectroscopy, Mapping, Geodesy, Cartography, Bathymetry, Status Report, Water/Hycean Worlds & Oceanography

Exoplanet Analog Observations Of Earth From Galileo Mission Disk-integrated Photometry

by Keith CowingFebruary 6, 2024February 6, 2024

The Galileo spacecraft had distant encounters with Earth in 1990 and 1992. Limited Solid State Imager (SSI) data acquired during these encounters has been previously presented, but the majority of […]

The diversity of Land/Ocean

Biosignatures & Paleobiology, Exoplanets, -moons, -comets, Habitable Zones, Imaging & Spectroscopy, Press Release

Earth-like Exoplanets Are Unlikely To Be Another ‘Pale Blue Dot’

by Keith CowingSeptember 20, 2022

When searching for Earth-like worlds around other stars, instead of looking for the ‘pale blue dot’ described by Carl Sagan, new research suggests that a hunt for dry, cold ‘pale […]