Knowra Euclid (space telescope) Euclid (space telescope) Euclid is a European Space Agency space telescope designed to map the geometry of the dark universe. It surveys galaxies using visible-light imaging and near-infrared spectroscopy and photometry.
Weak gravitational lensing : The small, coherent distortions of distant galaxy images caused by foreground matter's gravity. Euclid maps these distortions to infer the distribution of matter across cosmic time.
Euclid Wide Survey : Euclid's principal survey, covering a large fraction of the extragalactic sky in imaging and spectroscopy. This survey supplies the broad, deep galaxy catalog used for its main cosmological analyses.
Cosmic Vision : The European Space Agency's long-term science program for space missions. Euclid was selected as a medium-class mission within this program.
Nancy Grace Roman Space Telescope : A NASA space telescope designed for wide-field near-infrared surveys and studies of dark energy and exoplanets. Roman will test dark-energy models with complementary imaging and spectroscopic surveys.
Baryon acoustic oscillations : A preferred scale in the clustering of galaxies, inherited from sound waves in the early universe. Euclid measures this scale to trace cosmic expansion and constrain dark energy.
Euclid Deep Survey : Euclid's deeper observations of selected sky fields, reaching fainter galaxies than its wide survey. Repeated observations in these fields support calibration and studies of faint distant objects.
Dark Universe : The ESA science theme investigating dark matter, dark energy, and the universe's evolution. This theme framed Euclid's central scientific goals.
Vera C. Rubin Observatory : A ground-based observatory in Chile designed to repeatedly image the southern sky in visible light. Rubin's time-domain ground survey complements Euclid's space-based, higher-resolution mapping.
Photometric redshift : An estimate of an astronomical object's redshift derived from its brightness in multiple wavelength bands. Euclid uses multiband imaging to estimate distances for its enormous galaxy sample.
Galaxy evolution : The changes in galaxies' structures, stars, gas, and environments over cosmic time. Euclid's large samples reveal how galaxy populations and clustering change across the universe.
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