Paul M. Sutter, Author at Universe Today

January 30, 2023January 29, 2023 by Paul M. Sutter

Astronomers Prepare to Launch LuSEE Night, A Test Observatory on the Far Side of the Moon

Artist's illustration of a radio telescope inside a crater on the Moon. Credit: NASA JPL

Astronomers have not yet been able to map large portions of the radio emissions from our universe because of interference from the Earth itself. A team of astronomers hopes to change that, beginning with the LuSEE Night mission to the far side of the Moon. It will launch in 2025 and chart a new pathway to Lunar observatories.

January 29, 2023January 29, 2023 by Paul M. Sutter

Molecular Clouds Have Long Lives By Constantly Reassembling Themselves

This is a two-panel mosaic of part of the Taurus Giant Molecular Cloud, the nearest active star-forming region to Earth. The darkest regions are where stars are being born. Inside these vast clouds, complex chemicals are also forming. Image Credit: Adam Block /Steward Observatory/University of Arizona

Astronomers have recently discovered that giant clouds of molecular hydrogen, the birthplace of stars, can live for tens of millions of years despite the facts that individual molecules are constantly getting destroyed and reassembled. This new research helps place a crucial piece of understanding in our overall picture of how stars are born.

January 17, 2023January 11, 2023 by Paul M. Sutter

Using the Shadows of Clusters to Measure the Universe

Artist's impression of a quasar and a relativistic jet emanating from the center. Credit: NASA

Astronomers have begun using a sophisticated suite of simulations, an advanced machine learning model of the formation of galaxy clusters, and an exotic relationship between galaxies to understand the origins of dark matter and dark energy.

January 16, 2023January 11, 2023 by Paul M. Sutter

How did Dimorphos Form?

NASA's DART spacecraft is due to collide with the smaller body of the Didymos binary asteroid system on Sept. 26th, 2022. Credit: ESA

The otherwise unremarkable double asteroid of Didymos and Dimorphos made headlines as the target of NASA’s successful Double Asteroid Redirect Test (DART) mission. With new details about the system emerging, astronomers have put together a hypothesis of how this strange double asteroid came to be.

January 15, 2023January 11, 2023 by Paul M. Sutter

How Crazy Magnetic Fields Drive the Sun Mad

Solar coronal jets are fast moving plumes of plasma that erupt suddenly from the polar regions of the Sun. Astronomers believe that these help heat up the solar corona, but the physics behind the formation of these jets is poorly understood. Recently a team of astronomers have used observations with the Solar Dynamic Observatory and the Solar Orbiter to discover that multiple intertwining magnetic fields that connect and reconnect can power these fast moving jets.

January 14, 2023January 11, 2023 by Paul M. Sutter

Astronomers Spot an Orphaned Protostar

The HH 24 Complex (image credit: Reipurth et al.)

Astronomers have performed an impressive suite of observations at multiple wavelengths of the same system, dubbed the HH 24 complex. This complex hosts stars in the process of being born and the impacts of their violent interactions with each other, including the ejection of one of their siblings.

January 13, 2023January 11, 2023 by Paul M. Sutter

How Life Reshapes the Habitable Zone

An artist's impression of a warm, wet early Mars. Image Credit: Daein Ballard. CC-BY-SA-3.0

Astronomers are very interested in the Habitable Zone of distant stars, which is the orbital radius where liquid water, and therefore potentially life, can exist on a planet in that region. But life itself changes the characteristics of a planet. New research suggestions that life is even capable of redefining what the Habitable Zone can mean.

January 12, 2023January 11, 2023 by Paul M. Sutter

Astronomers Begin to Understand Strange “Backsplash” Galaxies

SMACS cluster from JWST shows evidence of dark matter — The galaxy cluster SMACS 0723 as seen by NIRCam on JWST. It's gravitational lensing properties (from its mass and from the mass of dark matter) are helping astronomers identify 88 distant galaxies in this field of view for further study. Courtesy NASA, ESA, CSA, STScI

Clusters of galaxies do not appear in an instant. Instead they gradually form through the accumulation of many galaxies. But when galaxies fall in they don’t just stop moving. Instead, they keep moving around. These are called backsplash galaxies, and astronomers are using them to help understand the formation history of their home clusters.

January 11, 2023January 10, 2023 by Paul M. Sutter

How a Rotating Universe Makes Time Travel Possible

Star trails at Balanced Rock in the Arches National Park in Utah on May 30, 2014. Credit and copyright: César Cantu.

It turns out that time travel into the past is actually relatively easy. All you need to do is make the universe rotate.

January 10, 2023January 10, 2023 by Paul M. Sutter

Blue Straggler Stars are Weird

This spectacular image of the star cluster Messier 47 was taken using the Wide Field Imager camera, installed on the MPG/ESO 2.2-metre telescope at ESO’s La Silla Observatory in Chile. This young open cluster is dominated by a sprinkling of brilliant blue stars but also contains a few contrasting red giant stars. Credit: ESO

All stars follow a particular path in their lives once they start fusing hydrogen. As they live they steadily get brighter and hotter until they turn to fusing other elements. Every star follows this exact same path…except the blue straggler stars.