Grapheme-colour synaesthesia is a condition in which the visual perception of letters or numbers induces a specific colour sensation. In this study, we demonstrated that the apparent physical ...

Streaks caused by satellites are visible in a image taken with the Vera C. Rubin Observatory in the foreground. Credit: RubinObs/NSF/DOE/NOIRLab/SLAC/AURA/W. O ...

Cepheid distances are determined through the so-called inverse-square law of light, which tells astronomers how a star’s apparent brightness diminishes with distance. If a star appears to have a ...

Cepheid variables are a type of star that undergo regular pulsations. The length of a Cepheid’s pulsations is always related to its intrinsic, or absolute, brightness in a simple way: The longer its ...

Elongation is the angle, in degrees, between the Sun and the planet as seen from here on the Earth. Superior planets (those that lie further from the Sun than us: Mars, Jupiter, Saturn, Uranus, ...