A new study has mapped out the gravitational basins of attraction in the local universe, offering fresh insights into the large-scale cosmic structures that shape the movement of galaxies. The study has been published in Nature Astronomy.
Category: space – Page 69
An international team of astronomers reports the discovery of a new extrasolar world orbiting a nearby star known as HD 86728. This is the first exoplanet detection made as part of the NEID Earth Twin Survey (NETS). The finding was detailed in a research paper published September 18 on the pre-print server arXiv.
Solar wind is a never-ending stream of charged particles coming from the sun. Rather than a constant breeze, this wind is rather gusty. As solar wind particles travel through space, they interact with the sun’s variable magnetic field, creating chaotic and fluctuating motion known as turbulence.
In May 2024, a geomagnetic storm hit Earth, sending auroras across the planet’s skies in a once-in-a-generation light display. These dazzling sights are possible because of the interaction of coronal mass ejections – explosions of plasma and magnetic field from the Sun – with Earth’s magnetic field, which protects us from the radiation the Sun spits out during turbulent storms.
But what might happen to humans beyond the safety of Earth’s protection? This question is essential as NASA plans to send humans to the Moon and on to Mars. During the May storm, the small spacecraft BioSentinel was collecting data to learn more about the impacts of radiation in deep space.
“We wanted to take advantage of the unique stage of the solar cycle we’re in – the solar maximum, when the Sun is at its most active – so that we can continue to monitor the space radiation environment,” said Sergio Santa Maria, principal investigator for BioSentinel’s spaceflight mission at NASA’s Ames Research Center in California’s Silicon Valley. “These data are relevant not just to the heliophysics community but also to understand the radiation environment for future crewed missions into deep space.”
Earth will get a “second moon” this weekend, but it won’t be sticking around for long.
How do the characteristics of Neptune-like exoplanets, also known as exo-Neptunes, differ from each other? This is what a recent study published in Astronomy and Astrophysics hopes to address as an international team of researchers investigated a new classification known as the “Neptunian Ridge”. This complements previous classifications of “Neptunian Desert” and “Neptunian Savannah”, with the former identifying exo-Neptunes that are rare in number but orbit very close to their parent stars while the “Neptune Savannah” describes exo-Neptunes that orbit much farther out. This study holds the potential to help astronomers better understand the formation and evolution of exo-Neptunes throughout the cosmos.
For the study, the researchers used confirmed and candidate exoplanets that comprise the Kepler DR25 catalog to ascertain the characteristic variations in exo-Neptunes while providing additional insights into the formation and evolution of exo-Neptunes, as well. In the end, they determined that this “Neptunian Ridge” exists as a middle-ground between the “Neptunian Desert” and “Neptunian Savannah”, with the former hypothesized to have formed from moving inward in their system from high-eccentricity tidal migration and the latter forming from disk-driven migration, which occurs right after planetary formation.
“Our work to observe this new structure in space is highly significant in helping us map the exoplanet landscape,” said Dr. David Armstrong, who is an Associate Professor of Physics at the University of Warwick and a co-author on the study. “As scientists, we’re always striving to understand why planets are in the condition they are in, and how they ended up where they are. The discovery of the Neptunian ridge helps answer these questions, unveiling part of the geography of exoplanets out there, and is a hugely exciting discovery.”
Twenty years ago, the MESSENGER mission revolutionized our understanding of Mercury. We sat down with project head and former Carnegie Science director Sean Solomon to talk about how the mission came together and the groundbreaking work it enabled.
Q: As the principal investigator of the MESSENGER mission, what were your personal highlights or proudest moments throughout the mission’s duration? Sean Solomon: There were many personal highlights for me during the MESSENGER mission, beginning with our initial selection by NASA in 1999 and culminating in the publication by the MESSENGER science team of all of the findings from our mission in a book published nearly two decades later.
The most challenging events in any planetary orbiter mission are launch and orbit insertion. The successful completion of those two milestones for MESSENGER—in 2004 and 2011, respectively—were sources of great pride for me in the technical expertise of all of the engineers, mission design experts, and project managers who contributed to the mission.
Last week, team scientists and the internet alike were amazed when Perseverance spotted a black-and-white striped rock unlike any seen on Mars before. Is this a sign of exciting discoveries to come?
Can an exoplanet’s atmosphere exhibit east-west asymmetry, meaning its two edges are vastly different from each other? This is what a recent study published in Nature Astronomy hopes to address as an international team of researchers led by the University of Arizona investigated the atmosphere of WASP-107 b, which is a Jupiter-sized exoplanet located approximately 211 light-years from Earth. This study holds the potential to help astronomers better understand the formation and evolution of exoplanets and how we can hopefully find Earth-like exoplanets, as well.
“This is the first time the east-west asymmetry of any exoplanet has ever been observed as it transits its star, from space,” said Matthew Murphy, who is a graduate student at the University of Arizona Steward Observatory and lead author of the study. “I think observations made from space have a lot of different advantages versus observations that are made from the ground.”
For the study, the researchers used NASA’s powerful James Webb Space Telescope (JWST) to observe the atmosphere of WASP-107 b, which is tidally locked to its parent star, meaning one side is always facing its parent star, much like how our Moon always has one side facing the Earth. This also makes studying an exoplanet’s atmosphere tricky since astronomers can only observe the back side of the exoplanet and analyzing the starlight passing through its atmosphere. However, with the help of novel methods, the researchers were able to analyze data obtained from the front side of WASP-107 b, thus confirming its atmospheric east-west asymmetry. Additionally, WASP-107 b also exhibits low density and low gravity, resulting in its atmosphere being inflated.
I’m actually getting Starlink because it’s competitively priced, and I can walk to my local Grocery Store up the street, and order it.
President Ruto had on Monday during a business roundtable meeting revealed that Starlink’s entry into the Kenyan market faced a lot of resistance from local players who felt the foreign firm’s entry would eat into their market share.
Ruto admitted during the roundtable that Kenya would be seeking more competitors in a bid to revolutionize the digital space in Kenya.
Locally, Starlink has been well received with many Kenyan companies and business owners signaling a shift in a bid to access alternative internet options.