Summer Triangle Corner: Vega

If you live in the Northern Hemisphere and look up during July evenings, you’ll see the brilliant star Vega shining overhead. Did you know that Vega is one of the most studied stars in our skies? As one of the brightest summer stars, Vega has fascinated astronomers for thousands of years.

Vega is the brightest star in the small Greek constellation of Lyra, the harp. It’s also one of the three points of the large “Summer Triangle” asterism, making Vega one of the easiest stars to find for novice stargazers. Ancient humans from 14,000 years ago likely knew Vega for another reason: it was the Earth’s northern pole star! Compare Vega’s current position with that of the current north star, Polaris, and you can see how much the direction of Earth’s axis changes over thousands of years. This slow movement of axial rotation is called precession, and in 12,000 years, Vega will return to the northern pole star position.

Bright Vega has been observed closely since the beginning of modern astronomy and even helped to set the standard for the current magnitude scale used to categorize the brightness of stars. Polaris and Vega have something else in common, besides being once and future pole stars: their brightness varies over time, making them variable stars. Variable stars’ light can change for many different reasons. Dust, smaller stars, or even planets may block the light we see from the star. Or the star itself might be unstable with active sunspots, expansions, or eruptions changing its brightness. Most stars are so far away that we only record the change in light, and can’t see their surface.

NASA’s TESS satellite has ultra-sensitive light sensors primed to look for the tiny dimming of starlight caused by transits of extrasolar planets. Their sensitivity also allowed TESS to observe much smaller pulsations in a certain type of variable star’s light than previously observed. These observations of Delta Scuti variable stars will help astronomers model their complex interiors and make sense of their distinct, seemingly chaotic pulsations. This is a major contribution towards the field of astroseismology: the study of stellar interiors via observations of how sound waves “sing” as they travel through stars. The findings may help settle the debate over what kind of variable star Vega is. Find more details on this research, including a sonification demo that lets you “hear” the heartbeat of one of these stars, at: bit.ly/DeltaScutiTESS
 
In 2024, the James Webb Space Telescope revisited the Vega system to reveal a 100-billion-mile-wide disk of dust around this star. While the debris disk is confirmed, there is no evidence of planets as of today.

Originally posted by Dave Prosper: June 2020
Last Updated by Kat Troche: July 2025

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NASA to Preview Advanced US-India Radar Mission Ahead of Launch

NASA will host a news conference at 12 p.m. EDT Monday, July 21, to discuss the upcoming NISAR (NASA-ISRO Synthetic Aperture Radar) mission.

The Earth-observing satellite, a first-of-its-kind collaboration between NASA and ISRO (Indian Space Research Organisation), carries an advanced radar system that will help protect communities by providing a dynamic, three-dimensional view of Earth in unprecedented detail and detecting the movement of land and ice surfaces down to the centimeter.

The NISAR mission will lift off from ISRO’s Satish Dhawan Space Centre in Sriharikota, on India’s southeastern coast. Launch is targeted for no earlier than late July.

NASA’s Jet Propulsion Laboratory in Southern California will stream the briefing live on its X, Facebook, and YouTube channels. Learn how to watch NASA content through a variety of platforms, including social media.

Participants in the news conference include:

• Nicky Fox, associate administrator, Science Mission Directorate, NASA Headquarters
• Karen St. Germain, director, Earth Science Division, NASA Headquarters
• Wendy Edelstein, deputy project manager, NISAR, NASA JPL
• Paul Rosen, project scientist, NISAR, NASA JPL

To ask questions by phone, members of the media must RSVP no later than two hours before the start of the event to: rexana.v.vizza@jpl.nasa.gov. NASA’s media accreditation policy is available online. Questions can be asked on social media during the briefing using #AskNISAR.

With its two radar instruments — an S-band system provided by ISRO and an L-band system provided by NASA — NISAR will use a technique known as synthetic aperture radar (SAR) to scan nearly all the planet’s land and ice surfaces twice every 12 days. Each system’s signal is sensitive to different sizes of features on Earth’s surface, and each specializes in measuring different attributes, such as moisture content, surface roughness, and motion.

These capabilities will help scientists better understand processes involved in natural hazards and catastrophic events, such as earthquakes, volcanic eruptions, land subsidence, and landslides.

Additionally, NISAR’s cloud penetrating ability will aid urgent responses to communities during weather disasters such as hurricanes, storm surge, and flooding. The detailed maps the mission creates also will provide information on both gradual and sudden changes occurring on Earth’s land and ice surfaces.

Managed by Caltech for NASA, JPL leads the U.S. component of the NISAR project and provided the L-band SAR. NASA JPL also provided the radar reflector antenna, the deployable boom, a high-rate communication subsystem for science data, GPS receivers, a solid-state recorder, and payload data subsystem. NASA’s Goddard Space Flight Center in Greenbelt, Maryland, manages the Near Space Network, which will receive NISAR’s L-band data.

Multiple ISRO centers have contributed to NISAR. The Space Applications Centre is providing the mission’s S-band SAR. The U R Rao Satellite Centre provided the spacecraft bus. The rocket is from Vikram Sarabhai Space Centre, launch services are through Satish Dhawan Space Centre, and satellite mission operations are by the ISRO Telemetry Tracking and Command Network. The National Remote Sensing Centre is responsible for S-band data reception, operational products generation, and dissemination.

To learn more about NISAR, visit:

https://nisar.jpl.nasa.gov

-end-

Karen Fox / Elizabeth Vlock
Headquarters, Washington
202-358-1600
karen.c.fox@nasa.gov / elizabeth.a.vlock@nasa.gov

Andrew Wang / Scott Hulme
Jet Propulsion Laboratory, Pasadena, Calif.
626-379-6874 / 818-653-9131
andrew.wang@jpl.nasa.gov / scott.d.hulme@jpl.nasa.gov

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Jessica Taveau

NASA’s Chandra Finds Baby Exoplanet is Shrinking

A star is unleashing a barrage of X-rays that is causing a closely-orbiting, young planet to wither away an astonishing rate, according to a new study using data from NASA’s Chandra X-ray Observatory and described in our latest press release. A team of researchers has determined that this planet will go from the size of Jupiter down to a small, barren world.

This graphic provides a visual representation of what astronomers think is happening around the star (known as TOI 1227) and a planet that is orbiting it at a fraction the distance between Mercury and the Sun. This “baby” planet, called TOI 1227 b, is just about 8 million years old, about a thousand times younger than our Sun. The main panel is an artist’s concept that shows the Jupiter-sized planet (lower left) around TOI 1227, which is a faint red star. Powerful X-rays from the star’s surface are tearing away the atmosphere of the planet, represented by the blue tail. The star’s X-rays may eventually completely remove the atmosphere.

The team used new Chandra data — seen in the inset — to measure the amounts of X-rays from TOI 1227 that are striking the planet. Using computer models of the effects of these X-rays, they concluded they will have a transformative effect, rapidly stripping away the planet’s atmosphere. They estimate that the planet is losing a mass equivalent to a full Earth’s atmosphere about every 200 years.

The researchers used different sets of data to estimate the age of TOI 1227 b. One method exploits measurements of how TOI 1227 b’s host star moves through space in comparison to nearby populations of stars with known ages. A second method compared the brightness and surface temperature of the star with theoretical models of evolving stars. The very young age of TOI 1227 b makes it the second youngest planet ever to be observed passing in front of its host star (a so-called transit). Previously the planet had been estimated by others to be about 11 million years old.

Of all the exoplanets astronomers have found with ages less than 50 million years, TOI 1227 b stands out for having the longest year and the host planet with the lowest mass. These properties, and the high dose of X-rays it is receiving, make it an outstanding target for future observations.

A paper describing these results has been accepted publication in The Astrophysical Journal and a preprint is available here. The authors of the paper are Attila Varga (Rochester Institute of Technology), Joel Kastner (Rochester Institute of Technology), Alexander Binks (University of Tubingen, Germany), Hans Moritz Guenther (Massachusetts Institute of Technology), and Simon J. Murphy (University of New South Wales Canberra in Australia).

NASA’s Marshall Space Flight Center in Huntsville, Alabama, manages the Chandra program. The Smithsonian Astrophysical Observatory’s Chandra X-ray Center controls science operations from Cambridge, Massachusetts, and flight operations from Burlington, Massachusetts.

Learn more about the Chandra X-ray Observatory and its mission here:

https://www.nasa.gov/chandra

https://chandra.si.edu

Visual Description

This release features an artist’s illustration of a Jupiter-sized planet closely orbiting a faint red star. An inset image, showing the star in X-ray light from Chandra, is superimposed on top of the illustration at our upper left corner.

At our upper right, the red star is illustrated as a ball made of intense fire. The planet, slightly smaller than the star, is shown at our lower left. Powerful X-rays from the star are tearing away the atmosphere of the planet, causing wisps of material to flow away from the planet’s surface in the opposite direction from the star. This gives the planet a slight resemblance to a comet, complete with a tail.

X-ray data from Chandra, presented in the inset image, shows the star as a small purple orb on a black background. Astronomers used the Chandra data to measure the amount of X-rays striking the planet from the star. They estimate that the planet is losing a mass equivalent to a full Earth’s atmosphere about every 200 years, causing it to ultimately shrink from the size of Jupiter down to a small, barren world.

News Media Contact

Megan Watzke
Chandra X-ray Center
Cambridge, Mass.
617-496-7998
mwatzke@cfa.harvard.edu

Corinne Beckinger
Marshall Space Flight Center, Huntsville, Alabama
256-544-0034
corinne.m.beckinger@nasa.gov

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NASA Software Catalog Puts Agency Solutions at Innovators’ Fingertips

NASA’s latest open Software Catalog, released Wednesday, offers more than 1,200 downloadable codes developed by agency engineers that could enable faster solutions to energize the space economy and stimulate American ingenuity. The catalog is part of NASA’s effort to place advanced technologies, including agency software, into the hands of businesses, researchers, and entrepreneurs to foster economic growth and innovation.

Agency developers will provide more information about the Software Catalog, the only repository of its kind in the federal government, during NASA’s summer software webinar series beginning Tuesday, July 22.

“NASA has droves of talented experts creating software to automate elements of agency missions,” said Dan Lockney, program executive, Technology Transfer at NASA Headquarters in Washington. “The resulting efficiency benefits humankind, and its public value increases exponentially when the agency provides access to those software programs for companies, enabling them to save time and money, improve commercial offerings, and build their businesses.”

The four webinars accompanying this year’s NASA Software Catalog feature developers of popular programs for mission planning, systems design, propulsion analysis, and more, each consisting of a presentation followed by a live question-and-answer session.

Programs offered in NASA’s 2025-2026 Software Catalog are grouped into 15 categories that may be useful for organizations working with spacecraft and aircraft. For example, the Vehicle Management category includes a tool for designing satellite constellations and a software library for minimizing public safety risks around expendable launch vehicles. The Aeronautics section includes several programs that are widely used by industry for creating, modifying, and analyzing aircraft designs.

Although the categories have specific themes, the codes are meant to be useful to various innovators. Companies can use aircraft programs NASA wrote to design cars, trucks, and countless other products. The catalog’s Business Systems and Project Management section includes software for estimating project costs, building and assessing complex schedules, and uncovering root causes of mishaps. Other popular programs support 3D rendering for simulation and virtual reality, bring hyper-accuracy to GPS tracking, and analyze electrical power system architectures.

NASA released its first Software Catalog more than a decade ago in 2013, and since then, the agency’s annual rate of software downloads has skyrocketed, reaching up to 5,722 downloads in a single year.

The Software Catalog is a product of NASA’s Technology Transfer program, managed by the agency’s Space Technology Mission Directorate. NASA routinely makes improvements to the Software Catalog website, ensuring the process is fast and easy. Access restrictions apply to some software that may be limited to use by U.S. citizens or for U.S. government purposes only.

View and learn more about NASA’s Software Catalog by visiting:

https://software.nasa.gov

-end-

Jasmine Hopkins
Headquarters, Washington
321-432-4624
jasmine.s.hopkins@nasa.gov   

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Gerelle Q. Dodson

Aurora Australis

The aurora australis arcs above a partly cloudy Indian Ocean in this photograph from the International Space Station as it orbited 269 miles above in between Australia and Antarctica on June 12, 2025.

Astronauts aboard the space station take photos using handheld digital cameras, usually through windows in the station’s cupola, for Crew Earth Observations. Crew members have produced hundreds of thousands of images of the Moon and Earth’s land, oceans, and atmosphere.

Image credit: NASA/Nichole Ayers

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Monika Luabeya