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A potentially hazardous object (PHO) is a near-Earth object – either an asteroid or a comet – with an orbit that can make close approaches to the Earth...

A gravity assist, gravity assist maneuver, swing-by, or generally a gravitational slingshot in orbital mechanics, is a type of spaceflight flyby which...

Delacroix is a crater on Mercury. Its name was adopted by the International Astronomical Union in 1979. Delacroix is named for the French painter Eugène...

The Rockwell X-30 was an advanced technology demonstrator project for the National Aero-Space Plane (NASP), part of a United States project to create a...

In physical cosmology, the inflationary epoch was the period in the evolution of the early universe when, according to inflation theory, the universe underwent...

A primary body – also called a central body, host body, gravitational primary, or simply primary – is the main physical body of a gravitationally bound...

Aryabhatta Research Institute of Observational Sciences (ARIES) is a research institute in Nainital, Uttarakhand, India which specializes in astronomy...

In astronomy, angular diameter distance is a distance defined in terms of an object's physical size, x {\displaystyle x} , and its angular size, θ {\displaystyle...

Setting circles are used on telescopes equipped with an equatorial mount to find celestial objects by their equatorial coordinates, often used in star...

James Pound (1669–1724) was an English clergyman and astronomer. He was the son of John Pound, of Bishops Cannings, Wiltshire, where he was born. He matriculated...

Star Walk is an educational astronomy smartphone app developed by Vito Technology which allows users to explore celestial objects in real-time. The application...

Leonid Stepanovich Dushkin (Леонид Степанович Душкин) (August 15, 1910 in the Spirove settlement of the Tver region – April 4, 1990), was a major pioneer...

GalileoMobile is a non-profitscience education organization that brings astronomy closer to young people worldwide. The GalileoMobile emphasis is on regions...

Launch lugs are small cylinders attached to the sides of most model rockets, into which the launch rod is placed prior to a launch. They are generally...

BRI 1335-0417 is the most distant known spiral galaxy, as of 2021. It is located in the Virgo constellation. The galaxy has a redshift of 4.4, meaning...