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By NASA
3 Min Read October’s Night Sky Notes: Catch Andromeda Rising!
Hot stars burn brightly in this new image from NASA’s Galaxy Evolution Explorer, showing the ultraviolet side of a familiar face. At approximately 2.5 million light-years away, the Andromeda galaxy, or M31, is our Milky Way’s largest galactic neighbor. Credits:
NASA If you’re thinking of a galaxy, the image in your head is probably the Andromeda Galaxy! Studies of this massive neighboring galaxy, also called M31, have played an incredibly important role in shaping modern astronomy. As a bonus for stargazers, the Andromeda Galaxy is also a beautiful sight.
Spot the Andromeda Galaxy! M31’s more common name comes from its parent constellation, which becomes prominent as autumn arrives in the Northern Hemisphere. Surprising amounts of detail can be observed with unaided eyes when seen from dark sky sites. Hints of it can even be made out from light polluted areas. Use the Great Square of Pegasus or the Cassiopeia constellation as guides to find it. Credit: Stellarium Web Have you heard that all the stars you see at night are part of our Milky Way galaxy? While that is mostly true, one star-like object located near the border between the constellations of Andromeda and Cassiopeia appears fuzzy to unaided eyes. That’s because it’s not a star, but the Andromeda Galaxy, its trillion stars appearing to our eyes as a 3.4 magnitude patch of haze. Why so dim? Distance! It’s outside our galaxy, around 2.5 million light years distant – so far away that the light you see left M31’s stars when our earliest ancestors figured out stone tools. Binoculars show more detail: M31’s bright core stands out, along with a bit of its wispy, saucer-shaped disc. Telescopes bring out greater detail but often can’t view the entire galaxy at once. Depending on the quality of your skies and your magnification, you may be able to make out individual globular clusters, structure, and at least two of its orbiting dwarf galaxies: M110 and M32. Light pollution and thin clouds, smoke, or haze will severely hamper observing fainter detail, as they will for any “faint fuzzy.” Surprisingly, persistent stargazers can still spot M31’s core from areas of moderate light pollution as long as skies are otherwise clear.
Generated version of the Andromeda Galaxy and its companion galaxies M32 and M110. Stellarium Web Modern astronomy was greatly shaped by studies of the Andromeda Galaxy. A hundred years ago, the idea that there were other galaxies beside our own was not widely accepted, and so M31 was called the “Andromeda Nebula.” Increasingly detailed observations of M31 caused astronomers to question its place in our universe – was M31 its own “island universe,” and not part of our Milky Way? Harlow Shapley and Heber Curtis engaged in the “Great Debate” of 1920 over its nature. Curtis argued forcefully from his observations of dimmer than expected nova, dust lanes, and other oddities that the “nebula” was in fact an entirely different galaxy from our own. A few years later, Edwin Hubble, building on Henrietta Leavitt’s work on Cepheid variable stars as a “standard candle” for distance measurement, concluded that M31 was indeed another galaxy after he observed Cepheids in photos of Andromeda, and estimated M31’s distance as far outside our galaxy’s boundaries. And so, the Andromeda Nebula became known as the Andromeda Galaxy.
This illustration shows the location of the 43 quasars scientists used to probe Andromeda’s gaseous halo. These quasars—the very distant, brilliant cores of active galaxies powered by black holes—are scattered far behind the halo, allowing scientists to probe multiple regions. Looking through the immense halo at the quasars’ light, the team observed how this light is absorbed by the halo and how that absorption changes in different regions. By tracing the absorption of light coming from the background quasars, scientists are able to probe the halo’s material. NASA, ESA, and E. Wheatley (STScI) These discoveries inspire astronomers to this day, who continue to observe M31 and many other galaxies for hints about the nature of our universe. One of the Hubble Space Telescope’s longest-running observing campaigns was a study of M31: the Panchromatic Hubble Andromeda Treasury (PHAT). Dig into NASA’s latest discoveries about the Andromeda Galaxy, on their Messier 31 page.
Originally posted by Dave Prosper: September 2021
Last Updated by Kat Troche: September 2024
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By NASA
Illustration of NASA’s BioSentinel spacecraft as it enters a heliocentric orbit. BioSentinel collected data during the May 2024 geomagnetic storm that hit Earth to learn more about the impacts of radiation in deep space.NASA/Daniel Rutter 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.”
BioSentinel – a small satellite about the size of a cereal box – is currently over 30 million miles from Earth, orbiting the Sun, where it weathered May’s coronal mass ejection without protection from a planetary magnetic field. Preliminary analysis of the data collected indicates that even though this was an extreme geomagnetic storm, that is, a storm that disturbs Earth’s magnetic field, it was considered just a moderate solar radiation storm, meaning it did not produce a great increase in hazardous solar particles. Therefore, such a storm did not pose any major issue to terrestrial lifeforms, even if they were unprotected as BioSentinel was. These measurements provide useful information for scientists trying to understand how solar radiation storms move through space and where their effects – and potential impacts on life beyond Earth – are most intense.
NASA’s Solar Dynamics Observatory captured this image of a solar flare on May 11, 2024. The image shows a subset of extreme ultraviolet light that highlights the extremely hot material in flares.NASA/SDO The original mission of BioSentinel was to study samples of yeast in deep space. Though these yeast samples are no longer alive, BioSentinel has adapted and continues to be a novel platform for studying the potential impacts of deep space conditions on life beyond the protection of Earth’s atmosphere and magnetosphere. The spacecraft’s biosensor instrument collects data about the radiation in deep space. Over a year and a half after its launch in Nov. 2022, BioSentinel retreats farther away from Earth, providing data of increasing value to scientists.
“Even though the biological part of the BioSentinel mission was completed a few months after launch, we believe that there is significant scientific value in continuing with the mission,” said Santa Maria. “The fact that the CubeSat continues to operate and that we can communicate with it, highlights the potential use of the spacecraft and many of its subsystems and components for future long-term missions beyond low Earth orbit.”
When we see auroras in the sky, they can serve as a stunning reminder of all the forces we cannot see that govern our cosmic neighborhood. As NASA and its partners seek to understand more about space environments, platforms like BioSentinel are essential to learn more about the risks of surviving beyond Earth’s sphere of protection.
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Last Updated Sep 26, 2024 Related Terms
General Ames Research Center Ames Research Center's Science Directorate Ames Space Biosciences CubeSats NASA Centers & Facilities Science & Research Small Satellite Missions View the full article
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By NASA
2 min read
Preparations for Next Moonwalk Simulations Underway (and Underwater)
The public is invited to celebrate International Observe the Moon Night on Saturday, Sept. 14, from 6 to 9 p.m. EDT at NASA Goddard’s Visitor Center in Greenbelt, Maryland.
International Observe the Moon Night is a time to come together with fellow Moon enthusiasts and curious people around the world. The public is invited to learn about lunar science and exploration, take part in celestial observations, and honor cultural and personal connections to the Moon.
Save the date! International Observe the Moon Night is September 14, 2024!NASA During the Goddard event, attendees will be able to participate in a variety of interactive hands-on activities. There will also be a photo booth, Moon-themed presentations, and lunar and astronomical observing with telescopes.
This free event is open to the public and will occur rain or shine.
International Observe the Moon Night occurs annually in September or October, when the Moon is around first quarter – a great phase for evening observing. Last year, almost a million people participated in 123 countries and all 7 continents. This year, NASA is celebrating 15 years of the program!
International Observe the Moon Night is sponsored by NASA’s LRO (Lunar Reconnaissance Orbiter) mission and the Solar System Exploration Division of NASA’s Goddard Space Flight Center, with support from many partners. LRO is managed by Goddard for the Science Mission Directorate at NASA Headquarters in Washington.
No registration is needed.
To participate in International Observe the Moon Night from wherever you may be, tune into our NASA+ broadcast or watch live streams of the Moon from telescopes around the world on our Live Streams page on Sept. 14: https://moon.nasa.gov/observe-the-moon-night/participate/live-streams/.
For directions to the Goddard Visitor Center, go to:
https://www.nasa.gov/centers/goddard/visitor/directions/index.html
To learn more about the program, visit:
https://moon.nasa.gov/observe-the-moon-night
For more information about LRO, visit:
https://science.nasa.gov/mission/lro
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Last Updated Sep 09, 2024 EditorWilliam SteigerwaldContactNancy N. Jonesnancy.n.jones@nasa.govLocationGoddard Space Flight Center Related Terms
Earth's Moon Lunar Reconnaissance Orbiter (LRO) Explore More
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By NASA
NASA’s Advanced Composite Solar Sail System is seen orbiting Earth in this 13-second exposure photograph, Monday, Sept. 2, 2024, from Arlington, Virginia. The mission team confirmed the spacecraft’s unique composite boom system unfurled its reflective sail on Thursday, Aug. 29, 2024, accomplishing a critical milestone in the agency’s demonstration of next-generation solar sail technology that will allow small spacecraft to “sail on sunlight.” Just as a sailboat is powered by wind in a sail, a spacecraft can use the pressure of sunlight on a solar sail for propulsion. This technology demonstration serves as a pathfinder for future missions powered by solar sail technology.NASA/Bill Ingalls Now that its reflective sail has deployed fully open in orbit, the Advanced Composite Solar Sail System can be seen in the night sky from many locations across the world!
Stargazers can join NASA’s #SpotTheSail campaign by using the NASA app on mobile platforms to find out when the spacecraft will be visible at their location. The app, which is free to use and available on iOS and Android, provides a location-specific schedule of upcoming sighting opportunities. A built-in augmented reality tool points users to the location of the spacecraft in real time.
Can you spot the solar sail? Share your viewing experience online using the hashtag #SpotTheSail for a chance to be featured on NASA’s website and social media channels.
Here’s how to use the sighting prediction tool:
Install and open the NASA app on an iOS or Android device. Tap on the “Featured” tab on the bottom navigation bar. Tap on the Advanced Composite Solar Sail System mission from the Featured Missions at the top of the screen. Tap on the “Sightings” tab on the bottom navigation bar. A list of all the upcoming sightings for your location will be displayed. If you are using an iOS device, you can tap on the “Sky View” link for an augmented reality guide to help you locate the spacecraft’s real-time location during the visible pass. NASA’s Advanced Composite Solar Sail System is testing new technologies in low Earth orbit, including a composite boom system that supports a four-piece sail. Not to be confused with solar panels, solar sails allow small spacecraft to “sail on sunlight,” eliminating the need for rocket fuel or other conventional propellants. This propulsion technology can enable low-cost deep space missions to increase access to space.
For ongoing mission updates, follow us on social media:
X: @NASAAmes, @NASA
Facebook: NASA Ames, NASA
Instagram: @NASAAmes, @NASA
NASA’s Ames Research Center in California’s Silicon Valley manages the Advanced Composite Solar Sail System project and designed and built the onboard camera diagnostic system. NASA’s Langley Research Center in Hampton, Virginia, designed and built the deployable composite booms and solar sail system. NASA’s Small Spacecraft Technology program office based at NASA Ames and led by the agency’s Space Technology Mission Directorate (STMD) in Washington, funds and manages the mission. NASA STMD’s Game Changing Development program developed the deployable composite boom technology. Rocket Lab USA, Inc of Long Beach, California, provided launch services. NanoAvionics provided the spacecraft bus.
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By NASA
A vivid aurora streams over the Earth as the International Space Station orbited 273 miles above the southern Indian Ocean in between Australia and Antarctica.
Image Credit: NASA/Shane Kimbrough
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