In 2017, a worldwide collection of radio telescopes gathered data about the event horizon around the supermassive black hole at the heart of M87. This was the first time we saw the shadow of a black hole. One year later, the Event Horizon Telescope, including the new Greenland Telescope, came together again. Today, we got the updated 2018 image showing that a bright spot in the ring has shifted by 30 degrees compared to the 2017 image.

Researchers have developed the first 3D maps of magnetic field structures within a spiral arm of the Milky Way. While we've seen smaller-scale magnetic fields before, this is much larger, showing the overall magnetic pattern in our galaxy. These fields are incredibly weak, about 100,000 times weaker than the Earth's magnetic field, but they impact the galaxy, strongly influencing star-forming regions.

Astronomers measure the Universe's expansion rate and have found a discrepancy between the speed nearby versus the speed measured in the Cosmic Microwave Background. This is known as the Hubble Tension, and the search is on for anything that could explain it. One possible explanation is measurement error, which causes the Cepheid variables in galaxies to be too close together, obscuring results. New observations from JWST have removed this as an explanation.