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Posts by
Theresa Wiegert
Oddly shaped suns and moons on the horizon
When light from the sun or the moon travels through more atmosphere to your eyes, you see oddly shaped suns or moons in interesting and beautiful ways.
April 26, 2023
How do you measure the mass of a star?
Binary stars - a star system consisting of two stars - are extremely useful. They give all the information needed to measure mass of a star. Here is how.
January 15, 2023
Andromeda and Milky Way galaxies are merging
The Milky Way and Andromeda merger has already begun. The two spiral galaxies will form one giant elliptical galaxy in 5 billion years.
March 2, 2022
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.
November 4, 2021
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.
July 19, 2021
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.
July 7, 2021
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.
June 27, 2021
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.
June 8, 2021
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.
June 3, 2021
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.
May 25, 2021
