The far-southern constellation Tucana is to be found at the end of the celestial river, Eridanus. It represents the large-beaked tropical bird that is native to South and Central America.

Astronomers discovered a new “Odd Radio Circle” (a mysterious ring invisible at all wavelengths except radio) near the center of our galaxy. I hope it’s playing space rock.

In 1610, Galileo's telescope revealed that the milky smear across the night sky is not a nebula but a field of tiny stars. Immanuel Kent guessed that the stars form a rotating disk and that the Earth is inside it.

In 1977 on August 20th, the Voyager 2 spacecraft was launched to visit the outer planets. In Dec. 2018 it passed Neptune and entered interstellar space. Voyager 2 is still transmitting data 47 years later!

A dense ball of 10.5 million stars, Omega Centauri is the biggest and brightest of about 200 globular clusters in the Milky Way galaxy. The average distance between its stars is just one tenth of a light year.

The sun’s corona can be 200 times hotter than the sun’s surface, despite being farther away from the ultimate source of heat at the sun’s core

Comet Encke was "discovered" in 1786, 1795,1805, and 1818 by different astronomers. These comets were found to be the same only after orbital calculations in 1819 by the German astronomer Johann Encke, who then predicted its return in 1822.

A new look at how light bends as it travels through the universe could point to an alternative theory of gravity

Retrograde motion is an effect of changing perspective. Inferior planets Mercury and Venus show retrograde motion on either side of inferior conjunction. They "overtake" Earth as they pass between Earth and the Sun.