Posts by 

Theresa Wiegert

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.

Going up and coming down this week

Within hours of each other, one rocket left the Earth on April 28, 2021, and one cargo space ship returned on April 29 - via a planned destruction during re-entry - after having been attached to the International Space Station for a year.

Radio waves from famous FRB surprisingly long and late

Astronomers have managed to detect very long wavelength radio emission from a well-studied, repeating fast radio burst, called FRB 20180916B. What's more, the longer wavelengths arrive 3 days after the shorter wavelength counterpart of the signal! Why?

Chemical fingerprint reveals a migrating exoplanet

The chemical fingerprint of exoplanet HD 209458b's atmosphere reveals as many as 6 molecules and that it has migrated inwards from its birthplace much farther out in its star system.

The closest extragalactic fast radio burst yet?

Astronomers detected a new, nearby, repeating fast radio burst, originating from a spot near the great spiral galaxy M81.

Hummingbird having a spring meal

Hummingbirds can fly up to 20 miles (32 km) in a day and are now traveling north, some all the way from Central America to Canada and even Alaska. This beautiful hummingbird was captured feeding from blossoms in California this week.

A new Goldilocks black hole

Astronomers have detected a "Goldilocks" or intermediate-mass black hole. It's not small, not supermassive - but right in the middle - and it "sheds light" on how the supermassive black holes got so large.

ISS passing a mineral moon

What's a mineral moon? In this case, it's a photo of our moon with the colors of its surface enhanced to reveal the moon's mineral deposits. As an added bonus, here's a mineral moon with the International Space Station passing by!

New image of M87’s supermassive black hole

The Event Horizon Telescope collaboration released a new image of the supermassive black hole in the center of massive galaxy M87 on March 24, 2021. The image shows the signatures of a magnetic field.