Horologium the Pendulum Clock is a constellation that lies in southern skies. Observers can best spot this constellation around the month of December.

Kelly Kizer Whitt

December 3, 2021

DART mission will hit and move an asteroid

The DART mission is due to launch November 23-24, 2021. It'll head to the moonlet of asteroid Didymos, where it'll crash into and slightly push the moonlet.

Kelly Kizer Whitt

November 24, 2021

Tiny-alien invasion risk: More space biosecurity measures needed?

Scientists urge the space industry to prepare for a tiny-alien invasion. They urge biosecurity measures to protect Earth and other planets from cross contamination of microbes.

Kelly Kizer Whitt

November 24, 2021

Ceres at opposition November 27

Ceres at opposition on November 27. The dwarf planet has been passing in front of the constellation Taurus the Bull all month, including near Aldebaran.

Kelly Kizer Whitt

November 24, 2021

Rare moon halo photo, captured during lunar eclipse

Eliot Herman in Tucson, Arizona, took an incredibly rare moon halo photo during the partial lunar eclipse on November 19, 2021.

Kelly Kizer Whitt

November 23, 2021

Kessler syndrome of colliding satellites could make low-Earth orbit unusable

Space debris threatens ISS: the Kessler syndrome, a theory developed by NASA scientist Donald Kessler, predicts cascading collisions in orbit.

Kelly Kizer Whitt

November 15, 2021

Landsat 9 returns its 1st Earth images

Landsat 9 took its first images of Earth on October 31, 2021. Enjoy these views of Earth from space, as Landsat 9 begins its monitoring of the land below.

Kelly Kizer Whitt

November 12, 2021

Kelly Kizer Whitt

Kelly Kizer Whitt writes and edits some of the most fascinating stories at EarthSky.org. She's been writing about science, with a focus on astronomy, for decades. She began her career at Astronomy Magazine and made regular contributions to other outlets, including AstronomyToday and the Sierra Club. She has nine published books, including a children's picture book, Solar System Forecast, and a young adult dystopian novel, A Different Sky.