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WikiVisually
The entire wiki reimagined as a visual magazine with video discovery · Watch your interests come alive
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Oort constants
Videos
The Oort constants A and B are empirically derived parameters that characterize the local rotational properties of our galaxy, the Milky Way, in the following manner:
Figure 1: Geometry of the Oort constants derivation, with a field star close to the Sun in the midplane of the Galaxy.
Figure 1: Geometry of the Oort constants derivation, with a field star close to the Sun in the midplane of the Galaxy.
Oort constants on a wall in Leiden, across a canal from the Leiden Observatory where Oort worked
Oort constants on a wall in Leiden, across a canal from the Leiden Observatory where Oort worked
Figure 2: Measuring the Oort constants by fitting to large data sets.
Figure 2: Measuring the Oort constants by fitting to large data sets.
Figure 3: Diagram of the various rotation curves in a galaxy
Figure 3: Diagram of the various rotation curves in a galaxy
Gaia (spacecraft)
Videos
Gaia is a retired space observatory of the European Space Agency that was launched in 2013 and operated until March 2025. The spacecraft was designed for astrometry: measuring the positions, distances
Artist's impression of the Gaia spacecraft
Artist's impression of the Gaia spacecraft
Model of Gaia at Paris Air Show 2013
Model of Gaia at Paris Air Show 2013
Gaia from different angle
Gaia from different angle
Gaia at its final phase of construction, 2013
Gaia at its final phase of construction, 2013