Universe Today

October 9, 2024October 9, 2024 by Mark Thompson

Good News. Comet Encke Only Threw a Handful of Giant Space Rocks in our Direction

This image taken by NASA's Spitzer Space Telescope shows the comet Encke riding along its pebbly trail of debris. Every October, Earth passes through Encke's wake, resulting in the well-known Taurid meteor shower.

As comets travel along their orbit they dump material along the way. A stream of debris known as the Taurid swarm has been keeping astronomers attention. It’s thought the debris is the remains of comet Encke which has also been fuelling the Taurid meteor shower. The swarm is believed to be composed of mostly harmless, tiny objects but there has been concern that there may be some larger, kilometre size chunks. Thankfully, new observations reveal there are of the order of 9-14 of these 1km rocks.

October 9, 2024October 9, 2024 by Mark Thompson

NASA Announces a New Class of Space Missions: Probe Explorers

NASA has sent a whole host of spacecraft across the Solar System and even beyond. They range from crewed ships to orbit and to the Moon to robotic explorers. Among them are a range of mission classes from Flagships to Discovery Class programs. Now a new category has been announced: Probe Explorers. This new category will fill the gap between Flagship and smaller missions. Among them are two proposed missions; the Advanced X-ray Imaging Satellite and the Probe Far-Infrared Mission for Astrophysics.

October 8, 2024October 8, 2024 by Carolyn Collins Petersen

The Open Star Cluster Westerlund 1, Seen by Webb

Here's Westerlund 1 in all its glory. This dense cluster of bright stars (with diffraction spikes from JWST's optics). They have a variety of sizes depending on their brightness and distance from us in the cluster, and different colors reflecting different types of star. Patches of billowing red gas can be seen in and around the cluster, lit up by the stars. Small stars in the cluster blend into a background of distant stars and galaxies on black. Courtesy ESA/Webb NASA & CSA, M. Zamani (ESA/Webb), M. G. Guarcello (INAF-OAPA) and the EWOCS team.

A long time ago, the Milky Way Galaxy was busy being a prodigious star-formation engine. In those times, it turned out dozens or hundreds of stars per year. These days, it’s rather more quiescent, cranking out only a few per year. Astronomers want to understand the Milky Way’s star-birth history, so they focus on some of the more recent star litters to study. One of them is Westerlund 1, a young so-called “super star cluster” that looks compact and contains a diverse array of older stars. It was part of a burst of star creation around 4 to 5 million years ago.

October 8, 2024October 8, 2024 by Mark Thompson

TESS Finds a Triple Star System that Could Fit within Mercury’s Orbit

This artist’s concept illustrates how tightly the three stars in the system called TIC 290061484 orbit each other. If they were placed at the center of our solar system, all the stars’ orbits would be contained a space smaller than Mercury’s orbit around the Sun. The sizes of the triplet stars and the Sun are also to scale. NASA’s Goddard Space Flight Center

TESS, the Transiting Exoplanet Survey Satellite has been on the lookout for alien worlds since 2018. It has just hit the news again having identified an extreme triple star system where two stars orbit each other every 1.8 days. The third component circles them both in 25 days – this puts the entire system within the orbit of Mercury with a little wriggle room to spare! To visual observers, it looks like a single star but the power of TESS revealed a flicker as the stars line up and pass one another along our line of sight. Eventually, the two inner stars will merge, triggering a supernova event!

October 7, 2024October 7, 2024 by Matt Williams

The JWST Reveals New Things About How Planetary Systems Form

This artist’s impression of a planet-forming disk surrounding a young star shows a swirling “pancake” of hot gas and dust from which planets form. Credit and ©: National Astronomical Observatory of Japan (NAOJ)

Every second in the Universe, more than 3,000 new stars form as clouds of dust and gas undergo gravitational collapse. Afterward, the remaining dust and gas settle into a swirling disk that feeds the star’s growth and eventually accretes to form planets – otherwise known as a protoplanetary disk. While this model, known as the Nebular Hypothesis, is the most widely accepted theory, the exact processes that give rise to stars and planetary systems are not yet fully understood. Shedding light on these processes is one of the many objectives of the James Webb Space Telescope (JWST).

In a recent study, an international team of astronomers led by University of Arizona researchers and supported by scientists from the Max Planck Institute of Astronomy (MPIA) used the JWST’s advanced infrared optics to examine protoplanetary disks around new stars. These observations provided the most detailed insights into the gas flows that sculpt and shape protoplanetary disks over time. They also confirm what scientists have theorized for a long time and offer clues about what our Solar System looked like roughly 4.6 billion years ago.

October 7, 2024October 7, 2024 by Mark Thompson

China Unveils its Lunar Spacesuit

China have a roadmap to sent astronauts to the Moon in 2030 and when they do, they are going with a very definite nod to the Chinese origins to the rocket! Their officials have unveiled the new look Chinese space suit with all the mod cons but with a design that is somewhat reminiscent of Chinese armour. There will some fabulous features like the close and long distance field of view visor, a chest control panel and a protective material to shield against the harmful lunar environment.

October 7, 2024October 7, 2024 by Andy Tomaswick

How Accessible is Titanium On The Moon?

A lunar mining facility harvests oxygen from the resource-rich volcanic soil of the eastern Mare Serenitatis.Credit: NASA/Pat Rawlings

Mining the Moon to extract its resources is a critical step on humanity’s path into the solar system. One of the most common resources on the Moon is considered relatively valuable here on Earth – titanium. At $10,000 a ton, it is one of the more valuable metals used in various industries, such as aerospace and nanotechnology. So, could we utilize titanium from the Moon to supply Earth’s economy with more of this valuable material? That question is the focus of a paper from researchers at Uppsala University in Finland.

October 7, 2024October 7, 2024 by Alan Boyle

Hera Probe Heads Off to See Aftermath of DART’s Asteroid Impact

SpaceX Falcon 9 rocket lifts off with Hera probe — A SpaceX Falcon 9 rocket sends the European Space Agency's Hera spacecraft into space from its Florida launch pad. (Credit: SpaceX)

The European Space Agency’s Hera spacecraft is on its way to do follow-up observations of Dimorphos, two years after an earlier probe knocked the mini-asteroid into a different orbital path around a bigger space rock.

Scientists say the close-up observations that Hera is due to make millions of miles from Earth, starting in 2026, will help them defend our planet from future threats posed by killer asteroids.

October 6, 2024October 6, 2024 by Matt Williams

Primordial Holes Could be Hiding in Planets, Asteroids, and Here on Earth

An artistic take on primordial black holes. Credit: NASA’s Goddard Space Flight Center

Small primordial black holes (PBHs) are one of the hot topics in astronomy and cosmology today. These hypothetical black holes are believed to have formed soon after the Big Bang, resulting from pockets of subatomic matter so dense that they underwent gravitational collapse. At present, PBHs are considered a candidate for dark matter, a possible source of primordial gravitational waves, and a resolution to various problems in physics. However, no definitive PBH candidate has been observed so far, leading to proposals for how we may find these miniature black holes.

Recent research has suggested that main-sequence neutron and dwarf stars might contain small PBHs in their interiors that are slowly consuming their gas supply. In a recent study, a team of physicists extended this idea to include a new avenue for potentially detecting PBHs. Basically, we could search inside objects like planets and asteroids or employ large plates or slabs of metal to detect PBHs for signs of their passage. By detecting the microchannels these bodies would leave, scientists could finally confirm the existence of PBHs and shed light on some of the greatest mysteries in cosmology today.

October 5, 2024October 5, 2024 by Carolyn Collins Petersen

The Milky Way Might be Part of an Even Larger Structure than Laniakea

A data visualization of the motions of galaxies in structures called basins of attraction. The Milky Way is the red dot. Courtesy of the University of Hawai'i.

If you want to pinpoint your place in the Universe, start with your cosmic address. You live on Earth->Solar System->Milky Way Galaxy->Local Cluster->Virgo Cluster->Virgo Supercluster->Laniakea. Thanks to new deep sky surveys, astronomers now think all those places are part of an even bigger cosmic structure in the “neighborhood” called The Shapley Concentration.