Astronomy

Astronomy is the science of celestial bodies, astronomical phenomenon and objects found within space. Astronomers would study the night sky and find stars, planets, comets and constellations. Several objects and buildings have been constructed to aid in the study, such as telescopes observatories.

Planets
Equestria is on a planet known as "Earth". There exist many planets around Equestria, but the vast majority of them have been unnamed and are inconsistently drawn, making the distinction between them hard to pin-point, however a planet resembling Saturn has been depicted on several occasions. One known planet includes "Marsh", a planet that was written about in science fiction as containing space aliens.

Other bodies
Equestria is located relatively near the "Horsehead Nebula", which the "Secretariat Comet" passes through routinely.