In 1920, astronomers Harlow Shapley and Heber Curtis held a Great Debate. Shapley argued that the spiral nebulae were small and in the Milky Way, while Curtis took a more radical position that they ...

Sky Tonight is an all-rounder app that helps you navigate the moon, stars, planets, constellations, comets, asteroids and ...

Messier was interested in comets, so his list was a set of fuzzy objects that might be mistaken for comets. He intended for comet hunters to avoid them since they did not move across the sky.

Magnetic Field Maps of the Sun's Corona Sep. 11 ... Starting Its Next Solar Cycle -- Despite Being Halfway Through Its Current One July 19, 2024 — The first rumblings of the Sun's next 11 ...

Whenever planets are visible in the night sky, they always appear roughly along the same line. This path, known as the ...

Seven planets are on display in the night sky at the end of February, but some will be harder to spot than others. Here’s ...

Between February 25 and February 28, all seven planets in our solar system will be visible in the night sky. It's known as a ...

Seven planets grace the sky at the end of February in what’s known as a planetary parade, though some will be difficult to spot NEW YORK -- Seven planets grace the sky at the end of February in ...

This phenomenon known as a "planet parade," will feature Mercury, Venus, Mars, Jupiter, Saturn, Uranus and Neptune all ...

from stars and constellations to bright planets, the moon, and sometimes special events like meteor showers. Observing the night sky can be done with no special equipment, although a sky map can ...