Don’t Make Me Wait for April 8!

Can’t wait to see the Moon block the Sun on April 8? Neither can we. But we have good news – if you want to see an incredible cosmic alignment, you can catch one right now! Exoplanets, asteroids, and other objects regularly pass in front of stars and block their light. Observing these events is easier than you might think – and it can be a fantastic way to contribute to NASA science.

There are three main kinds of cosmic alignments that temporarily block our view of a star. Each one can help us pick out fine details about astronomical objects that can’t be observed any other way.

Eclipse – when one object blocks another that’s apparently similar in size.

Occultation – when a relatively big object completely blocks an apparently smaller object.

Transit – when an apparently small object passes in front of a larger star, blocking some but not all of its light.

You’ll notice that we use the word “apparently” in each of those definitions. That’s because what matters is how big the object looks from our perspective, not how big it actually is.

Now let’s look at some science projects you can get involved in that observe these phenomena.

Eclipses help scientists see faint objects next to bright objects. Just like you might raise your hand to block light from your car’s headlight while you search the ground for your keys, eclipses block the overpowering light from a star so objects around it can be viewed more easily. This is what the Eclipse Megamovie project, the Dynamic Eclipse Broadcast Initiative, and Citizen CATE 2024 are doing: taking advantage of the Moon blocking the fierce sunlight so they can see what’s happening right around the Sun. These projects invite you to help them use this method to study the Sun’s faint corona. Eclipses and occultations can also tell us about the relative sizes and shapes of objects. This is how Sunsketcher will harness the April 8 eclipse. With your help, they will use our precise knowledge of the size and topography of the Moon to vastly improve estimates of the shape of the Sun. At the very beginning and end of totality, viewers will see Baily’s Beads – bright spots of light around the Moon’s edge where rays of sunlight slip through the valleys between the mountains on the Moon’s surface just before and after totality. The SunSketcher app will capture images of these beads along with precise time and location data of each observation. Following the eclipse, the SunSketcher team will use the collected observations to calculate the shape of the Sun.

When an object transits – or passes in front of – a star, the star’s light dims. Measuring changes in starlight to search for these transits has revealed thousands of exoplanets (planets orbiting other stars) in recent years. You can join the search today! Three NASA citizen science projects are focused on investigating exoplanets using transits.

• Planet Hunters TESS invites everyone to look for traces of transiting planets in the changing light of distant stars. The most promising of these signals indicate “exoplanet candidates” to be confirmed through additional observations. This project, hosted on the Zooniverse platform, can be done on a smartphone or a computer.
• Exoplanet Watch is a community of people who use their own telescopes or a shared community robotic telescope to observe exoplanet candidates to better predict the next time the objects will transit. This project requires an internet-connected computer.
• UNITE, like Exoplanet Watch, is a community of folks using their telescopes to observe exoplanet candidates. This community uses Unistellar telescopes, which operate on a standard, user-friendly system. The UNITE and Exoplanet Watch teams often share data and collaborate!

Whichever events you observe, or whichever projects you choose to contribute to, we’re sure you’ll find yourself marveling at our presence on this wonderful planet in this mysterious universe. You don’t have to wait until April 8!

by Sarah Kirn and Marc J. Kuchner
NASA Citizen Science

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MEDIA ADVISORY: S24-015 NASA Invites Media to Milestone RS-25 Engine Certification Test

NASA will host media to view a milestone RS-25 engine test at NASA’s Stennis Space Center on Wednesday, April 3, to certify full production of new engines to help power the SLS (Space Launch System) rocket on Artemis missions to the Moon and beyond.

As NASA explores the universe for the benefit of all, NASA Stennis is testing engines and systems that will help launch the SLS rocket and Orion spacecraft on future deep space missions. The April 3 test will mark completion of a 12-test series to certify production of RS-25 engines by lead contractor Aerojet Rocketdyne, an L3Harris Technologies company, to help power missions beginning with Artemis V.

In addition to the engine hot fire on the Fred Haise Test Stand, media will have an opportunity to tour the Aerojet Rocketdyne Engine Assembly Facility onsite, to receive a briefing at the Thad Cochran Test Stand (B-2) about upcoming exploration upper stage testing, and to interview NASA officials and others.

The RS-25 hot fire viewing is targeted for early- to mid-afternoon.

Following the hot fire, media also will have a chance to gather onsite to view and participate in the NASA news conference announcing the company, or companies, selected to move forward in development of the lunar terrain vehicle (LTV) that will help Artemis astronauts explore more of the Moon’s surface on future missions. The news conference will be broadcast at 3 p.m. CDT from NASA’s Johnson Space Center in Houston.

Media members interested in attending should:

• Be a U.S. citizen.
• Contact Lacy Thompson at calvin.l.thompson@nasa.gov no later than 12 p.m. on Monday, April 1.
• Provide name as it appears on driver’s license.
• Identify state issuing the license.
• Provide a mobile contact number.

Please note NASA’s media accreditation policy online.

Media members must arrive from 9 a.m. to 9:30 a.m. on Wednesday, April 3, at INFINITY Science Center, the official visitors center for NASA Stennis, and produce valid driver’s license for transport on site. INFINITY is located at 1 Discovery Circle in Pearlington, Mississippi. Long pants and closed-toe shoes are required attire.

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Three-Year Study of Young Stars with NASA’s Hubble Enters New Chapter

In the largest and one of the most ambitious Hubble Space Telescope programs ever executed, a team of scientists and engineers collected information on almost 500 stars over a three-year period. This effort offers new insights into the stars’ formation, evolution, and impact on their surroundings. 

This comprehensive survey, called ULLYSES (Ultraviolet Legacy Library of Young Stars as Essential Standards), was completed in December 2023, and provides a rich spectroscopic dataset obtained in ultraviolet light that astronomers will be mining for decades to come. Because ultraviolet light can only be observed from space, Hubble is the only active telescope that can accomplish this research. 

“I believe the ULLYSES project will be transformative, impacting overall astrophysics – from exoplanets, to the effects of massive stars on galaxy evolution, to understanding the earliest stages of the evolving universe,” said Julia Roman-Duval, Implementation Team Lead for ULLYSES at the Space Telescope Science Institute (STScI) in Baltimore, Maryland. “Aside from the specific goals of the program, the stellar data can also be used in fields of astrophysics in ways we can’t yet imagine.”

The ULLYSES team studied 220 stars, then combined those observations with information from the Hubble archive on 275 additional stars. The program also included data from some of the world’s largest, most powerful ground-based telescopes and X-ray space telescopes. The ULLYSES dataset is made up of stellar spectra, which carry information about each star’s temperature, chemical composition, and rotation. 

One type of stars studied under ULLYSES is super-hot, massive, blue stars. They are a million times brighter than the Sun and glow fiercely in ultraviolet light that can easily be detected by Hubble. Their spectra include key diagnostics of the speed of their powerful winds. The winds drive galaxy evolution and seed galaxies with the elements needed for life. Those elements are cooked up inside the stars’ nuclear fusion ovens and then injected into space as a star dies. ULLYSES targeted blue stars in nearby galaxies that are deficient in elements heavier than helium and hydrogen. This type of galaxy was common in the very early universe. “ULLYSES observations are a stepping stone to understanding those first stars and their winds in the universe, and how they impact the evolution of their young host galaxy,” said Roman-Duval.  

The other star category in the ULLYSES program is young stars less massive than our Sun. Though cooler and redder than our Sun, in their formative years they unleash a torrent of high-energy radiation, including blasts of ultraviolet light and X-rays. Because they are still growing, they are gathering material from their surrounding planet-forming disks of dust and gas. The Hubble spectra include key diagnostics of the process by which they acquire their mass, including how much energy this process releases into the surrounding planet-forming disk and nearby environment. The blistering ultraviolet light from young stars affects the evolution of these disks as they form planets, as well as the chances of habitability for newborn planets. The target stars are located in nearby star-forming regions in our Milky Way galaxy.

The ULLYSES concept was designed by a committee of experts with the goal of using Hubble to provide a legacy set of stellar observations. “ULLYSES was originally conceived as an observing program utilizing Hubble’s sensitive spectrographs. However, the program was tremendously enhanced by community-led coordinated and ancillary observations with other ground- and space-based observatories,” said Roman-Duval. “Such broad coverage allows astronomers to investigate the lives of stars in unprecedented detail and paint a more comprehensive picture of the properties of these stars and how they impact their environment.”

To that end, STScI hosted a ULLYSES workshop March 11–14 to celebrate the beginning of a new era of research on young stars. The goal was to allow members of the astronomical community to collaborate on the data, so that they could gain momentum in the ongoing analyses, or kickstart new ideas for analysis. The workshop was one important step in exploiting this legacy spectral library to its fullest potential, fulfilling the promise of ULLYSES.

The Hubble Space Telescope has been operating for over three decades and continues to make ground-breaking discoveries that shape our fundamental understanding of the universe. Hubble is a project of international cooperation between NASA and ESA (European Space Agency). NASA’s Goddard Space Flight Center in Greenbelt, Maryland, manages the telescope and mission operations. Lockheed Martin Space, based in Denver, Colorado, also supports mission operations at Goddard. The Space Telescope Science Institute in Baltimore, Maryland, which is operated by the Association of Universities for Research in Astronomy, conducts Hubble science operations for NASA.

Media Contacts:

Claire Andreoli
NASA’s Goddard Space Flight Center, Greenbelt, MD
claire.andreoli@nasa.gov

Ann Jenkins / Ray Villard
Space Telescope Science Institute, Baltimore, MD

Science Contact:

Julia Roman-Duval
Space Telescope Science Institute, Baltimore, MD

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NASA Astronaut Loral O’Hara, Expedition 70 Science Highlights

NASA astronaut Loral O’Hara is returning home after six months aboard the International Space Station. During her time on the orbiting laboratory, O’Hara contributed to dozens of scientific investigations and technology demonstrations to prepare for future space exploration missions and generate innovations and benefits for humanity on Earth.

Here is a look at some of the scientific activities O’Hara conducted during her mission:

Biking for Better Health

NASA astronaut Loral O’Hara is among the first astronauts participating in the CIPHER (Complement of Integrated Protocols for Human Exploration Research on Varying Mission Durations) investigation. CIPHER examines physiological and psychological changes that humans undergo during spaceflight. One of the protocols measures changes in cardiorespiratory and muscle fitness during exercise. Collecting data from crew members on missions of different durations supports development of ways to protect crew member health on a long mission such as a trip to Mars.

Tending the Space Garden

NASA astronaut Loral O’Hara works with tomato plants grown for Plant Habitat-06, an investigation using genetic analysis to examine how spaceflight affects plant immune function and production. Results could support development of crops to provide food and other services on future space missions. On Earth, pathogens are responsible for up to 40% of global crop loss, and insight into the interaction between gravity and how plants respond to pathogens could inform strategies to enhance crop growth and productivity.

Reading Radiation Exposure

Crew members pose with active dosimeters: left to right, Andreas Mogensen of ESA (European Space Agency), NASA astronauts Loral O’Hara and Jasmin Moghbeli, and Satoshi Furukawa of JAXA (Japan Aerospace Exploration Agency). These devices monitor individual radiation exposure for the International Space Station Internal Radiation Monitoring investigation, which aims to keep ionizing radiation exposure at levels acceptable for maintaining crew member health and safety and ensuring the success of their missions.

Understanding Bone Loss

Bone loss is a major problem of aging on Earth and a serious health concern for astronauts. MABL-A (Microgravity Associated Bone Loss-A) examines the effect of microgravity on bone marrow mesenchymal stem cells, which produce bone-forming cells and play a role in making and repairing skeletal tissues. NASA astronaut Loral O’Hara works inside the Life Science Glovebox for the investigation, which could improve understanding of the mechanisms behind bone loss and support development of ways to better protect crew members and people on Earth from its effects.

Bringing in the Cold

NASA astronauts Jasmin Moghbeli and Loral O’Hara pose in front of the Cold Atom Lab. The lab produces clouds of atoms so cold that they have almost no motion, allowing researchers to observe their fundamental behaviors and quantum characteristics. Physicists have long pursued ever colder temperatures, and microgravity may make it possible to achieve those temperatures for longer periods of time. The Cold Atom Lab research could facilitate the development of new quantum technology.

Taking Out the Heat

NASA astronaut Loral O’Hara works on MaRVIn-PCIM (Microgravity Research for Versatile Investigations-Phase Change in Mixtures), which examines the dynamics of liquid and vapor flow inside a wickless heat pipe. These devices, used to dissipate heat to cool satellites and electronics, operate differently in microgravity than on Earth. Results could support development of lighter and more efficient cooling devices for future space exploration.

Preparing for a Walk in Space

NASA astronaut Loral O’Hara tests components of her spacesuit in preparation for a spacewalk. O’Hara and NASA astronaut Jasmin Moghbeli conducted a spacewalk together on Nov 1, 2023. It took the duo six hours and 42 minutes to complete tasks that included working on hardware that enables the space station’s solar arrays to track the Sun, helping to provide power for scientific operations on the orbiting lab.

Creating Cardiac Tissues

NASA astronaut Loral O’Hara works on the Redwire Cardiac Bioprinting Investigation (BFF Cardiac), which studies bio-printed cardiac tissues. Higher-quality 3D tissues can be printed in microgravity, where density layers, settling, and other effects of gravity are absent. This technology supports development of ways to print food and medicine on demand on future missions, reducing mass and cost at launch and improving crew health and safety. Results also could advance technologies to create replacement organs and tissues for transplant on Earth, helping to alleviate shortages.

Melissa Gaskill
International Space Station Research Communications Team
Johnson Space Center

Search this database of scientific experiments to learn more about those mentioned above.

Download full-resolution versions of all photos in this article.

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Stunning Echo of 800-year-old Explosion

In the year 1181 a rare supernova explosion appeared in the night sky, staying visible for 185 consecutive days. Historical records show that the supernova looked like a temporary ‘star’ in the constellation Cassiopeia shining as bright as Saturn.

Ever since, scientists have tried to find the supernova’s remnant. At first it was thought that this could be the nebula around the pulsar — the dense core of a collapse star — named 3C 58. However closer investigations revealed that the pulsar is older than supernova 1181.

In the last decade, another contender was discovered; Pa 30 is a nearly circular nebula with a central star in the constellation Cassiopeia. It is pictured here combining images from several telescopes. This composite image uses data across the electromagnetic spectrum and shows a spectacular new view of the supernova remnant. This allows us to marvel at the same object that appeared in our ancestors’ night sky more than 800 years ago.

X-ray observations by ESA’s XMM-Newton (blue) show the full extent of the nebula and NASA’s Chandra X-ray Observatory (cyan) pinpoints its central source. The nebula is barely visible in optical light but shines bright in infrared light, collected by NASA’s Wide-field Infrared Space Explorer (red and pink). Interestingly, the radial structure in the image consists of heated sulfur that glows in visible light, observed with the ground-based Hiltner 2.4 m telescope at the MDM Observatory (green) in Arizona, USA, as do the stars in the background by Pan-STARRS (white) in Hawaii, USA.

Studies of the composition of the different parts of the remnant have led scientists to believe that it was formed in a thermonuclear explosion, and more precisely a special kind of supernova called a sub-luminous Type Iax event. During this event two white dwarf stars merged, and typically no remnant is expected for this kind of explosion. But incomplete explosions can leave a kind of ‘zombie’ star, such as the massive white dwarf star in this system. This very hot star, one of the hottest stars in the Milky Way (about 200 000 degrees Celsius), has a fast stellar wind with speeds up to 16,000 km/h. The combination of the star and the nebula makes it a unique opportunity for studying such rare explosions.

The Smithsonian Astrophysical Observatory’s Chandra X-ray Center controls science operations from Cambridge, Massachusetts, and flight operations from Burlington, Massachusetts.

Read more from NASA’s Chandra X-ray Observatory.

For more Chandra images, multimedia and related materials, visit:

https://www.nasa.gov/mission/chandra-x-ray-observatory/

Visual Description:

This is a composite image of SNR 1181, the remains of an explosion hundreds of years ago caused by the merger of two stars.

A bright, multi-colored, spherical nebula sits in the middle of the canvas surrounded by a field of stars that appear as white dots. In the center of the nebula is a small point of aqua-colored light. This is the hot white dwarf star that was left behind after the likely merger of two smaller white dwarfs caused an explosion. From this single point of aqua light, several spectacular rays expand outward, resembling a single firework bursting in celebration in the night sky.

News Media Contact

Megan Watzke
Chandra X-ray Center
Cambridge, Mass.
617-496-7998

Jonathan Deal
Marshall Space Flight Center
Huntsville, Ala.
256-544-0034

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Lee Mohon