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The Sky This Week from January 17 to 26

Exotic Objects, Milky Way, Stars

Four strange new objects found around the Milky Way’s huge black hole

Exoplanets, Planets, Stars

Second terrestrial planet found around closest star to the Sun

Human Spaceflight, Space Exploration

NASA will broadcast final spacewalk to repair AMS

Binary stars may be an explanation for powerful gamma-ray bursts

The Babylonians adopted a seven-day week due to the the seven celestial bodies they observed in the sky: the Sun, the Moon, Mercury, Venus, Mars, Jupiter, and Saturn. This image of a lunar eclipse over the Swiss Alps highlights four of the seven objects. The Moon is the brightest object to the left. Mars is located directly below the Moon. Saturn is near the middle. And Jupiter hovers to the right. Kaustav Ghose/Flickr

Why does a week have seven days?

Scientists find meteorite pieces older than the solar system

Exotic Objects, Stars

Binary star V Sagittae expected to light up the night sky in 2083

The Sky This Week from January 10 to 19

Human Spaceflight, Robotic Spaceflight

With more Starlink satellites, astronomers keep voicing concerns

Probing the cosmos for flaws in Einstein’s general relativity

Cosmology, Galaxies

Astronomers see how the universe first lit up from most distant galaxy cluster