Posts by 

Theresa Wiegert

Oddly shaped suns and moons near the horizon

When light from the sun or the moon travels through more atmosphere to your eyes, you see the sun or moon distorted in interesting and beautiful ways.

A storm on the sun, and a great week for auroras

Aurora alert in effect for the next few days: the sun sent out a halo coronal mass ejection on November 2, 2021, due to arrive at Earth on November 4.

Astronomy art: Voices of Apollo 11

Voices of Apollo 11 is an image of the moon, made of the words transmitted from the moon by Apollo 11 astronauts. Astronomy artist J-P Metsavainio created it.

Finally, an electron-capture supernova

"We started by asking ‘what’s this weirdo?’ the astronomers said. Now they recognize SN 2018zd as an electron-capture supernova.

Supermassive black holes help with star birth

Supermassive black holes help form stars, according to a new study. They do it by clearing the way in the outskirts of the galaxies where they reside.

Milky Way center: Threads of hot gas and magnetic fields

An astronomer combined 2 decades worth of X-ray data with radio observations, creating an extraordinary image of the Milky Way center.

The most ancient spiral galaxy yet

Astronomers have discovered a spiral galaxy surprisingly near the beginning of the universe, making it the most ancient spiral galaxy found so far.

Alien stars found in our Milky Way

Astronomers precisely measured the ages of 100 red giant stars. Many are alien stars from another galaxy, which merged with ours 10 billion years ago.

Sharks navigate using Earth’s magnetic field

Longstanding mystery solved! New research shows that - just as lobsters, turtles and some birds do - sharks navigate using Earth's magnetic field,

Cool sun image

EarthSky readers submit wonderful photos to us every day. This week we received this interesting composite image of the sun, our nearest star.