Posts by 

Theresa Wiegert

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.

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 the stars masses'. Here is how.

Map of Milky Way halo reveals dark matter ocean

The gravity of the Large Magellanic Cloud - one of the Milky Way's satellite dwarf galaxies - is collecting stars behind it in a trail, like the wake from a boat, as it travels through our galaxy's halo.