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Hubble's Latest Look at Pluto's Moons Supports a Common Birth
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By NASA
2 min read
Preparations for Next Moonwalk Simulations Underway (and Underwater)
We’ve been talking about this for 2,000 years. Aristotle mentions it. And in our own time, scientists are designing experiments to figure out exactly what’s going on. But there’s no consensus yet.
Here’s what we do know.
The atmosphere isn’t magnifying the Moon. If anything, atmospheric refraction squashes it a little bit. And the Moon’s not closer to us at the horizon. It’s about 1.5 percent farther away. Also, it isn’t just the Moon. Constellations look huge on the horizon, too.
One popular idea is that this is a variation on the Ponzo illusion. Everything in our experience seems to shrink as it recedes toward the horizon — I mean clouds and planes and cars and ships. But the Moon doesn’t do that. So our minds make up a story to reconcile this inconsistency. Somehow the Moon gets bigger when it’s at the horizon. That’s one popular hypothesis, but there are others. And we’re still waiting for the experiment that will convince everyone that we understand this.
So why does the Moon look larger on the horizon? We don’t really know, but scientists are still trying to figure it out.
[END VIDEO TRANSCRIPT]
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Last Updated Feb 12, 2025 Related Terms
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By NASA
3 min read
Preparations for Next Moonwalk Simulations Underway (and Underwater)
Artist’s concept of an emergency response flyer from a team at Texas A&M University and Oklahoma State University, one of 14 university teams that received NASA-supported GoAERO awards in 2025.Texas A&M University and Oklahoma State University With support from NASA, the international GoAERO Prize competition recently announced funding for 14 U.S. university teams to build innovative new compact emergency response aircraft.
The teams will develop prototype versions of Emergency Response Flyers, aircraft intended to perform rescue and response missions after disasters and in crisis situations. The flyers must be designed to deliver a first responder, evacuate victims, provide emergency medical supplies, and aid in humanitarian efforts. Teams will bring their test aircraft to a fly-off expected in 2027.
These awards will provide students with an opportunity that might have otherwise been difficult – a chance to design and build potentially lifesaving aircraft.
koushik datta
NASA Project Manager
“These awards will provide students with an opportunity that might have otherwise been difficult – a chance to design and build potentially lifesaving aircraft,” said Koushik Datta, University Innovation Project manager in NASA’s Aeronautics Research Mission Directorate at NASA Headquarters in Washington. “At NASA, we’re looking forward to seeing how these young innovators can contribute to our mission to advance futuristic aviation technologies that can benefit first responders and the public.”
With support from NASA’s University Innovation Project, GoAERO named 14 awardee teams at the following universities:
Auburn University, in Leeds, Alabama California Polytechnic University, in Pomona Carnegie Mellon University, in Pittsburgh Embry-Riddle Aeronautical University, in Daytona Beach, Florida Georgia Institute of Technology, in Atlanta North Carolina Agricultural & Technical State University, in Greensboro North Carolina State University, in Raleigh The Ohio State University, in Columbus Penn State University, in State College Purdue University, in West Lafayette, Indiana Saint Louis University Texas A&M University, in College Station, and Oklahoma State University, in Stillwater University of Texas, Austin Virginia Tech, in Blacksburg Student teams can utilize the funds to purchase parts, materials, batteries, and other components for building their aircrafts.
When naming the university awardees, GoAERO – in partnership with Boeing, RTX, and Honeywell – also announced 11 winners of Stage 1 of its competition. These include teams from the private sector and universities. These awardees were selected to build full- or smaller-scale flyers for evaluation. Eight entries will be selected for the next round of Stage 2 awards. The GoAERO Prize is still accepting new teams. While prizes are awarded at Stage 1 and Stage 2, teams do not need to win prizes to continue on to the next stage or compete in the final fly-off.
In addition to the University Innovation Project support for the university teams, NASA has partnered with GoAERO through a non-funded Space Act Agreement to provide U.S. teams with mentorship, educational opportunities, and access to specialized software tools.
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Last Updated Feb 11, 2025 EditorLillian GipsonContactJim Bankejim.banke@nasa.gov Related Terms
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By Space Force
The USSF Honor Guard is participating in the thier first state funeral honoring the 39th President of the United States Jimmy Carter.
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By NASA
On Jan. 7, 1610, Italian astronomer Galileo Galilei peered through his newly improved 20-power homemade telescope at the planet Jupiter. He noticed three other points of light near the planet, at first believing them to be distant stars. Observing them over several nights, he noted that they appeared to move in the wrong direction with regard to the background stars and they remained in Jupiter’s proximity but changed their positions relative to one another. Four days later, he observed a fourth point of light near the planet with the same unusual behavior. By Jan. 15, Galileo correctly concluded that he had discovered four moons orbiting around Jupiter, providing strong evidence for the Copernican theory that most celestial objects did not revolve around the Earth.
Two of Galileo’s telescopes.National Geographic. Painting by Giuseppe Bertini (1858) of Galileo demonstrating his telescope to the Doge of Venice.gabrielevanin.it Page from Galileo’s notebook about his observations of Jupiter’s satellites.University of Michigan Special Collections Library. In March 1610, Galileo published his discoveries of Jupiter’s satellites and other celestial observations in a book titled Siderius Nuncius (The Starry Messenger). As their discoverer, Galileo had naming rights to Jupiter’s satellites. He proposed to name them after his patrons the Medicis and astronomers called them the Medicean Stars through much of the seventeenth century, although in his own notes Galileo referred to them by the Roman numerals I, II, III, and IV, in order of their distance from Jupiter. Astronomers still refer to the four moons as the Galilean satellites in honor of their discoverer.
In 1614, the German astronomer Johannes Kepler suggested naming the satellites after mythological figures associated with Jupiter, namely Io, Europa, Ganymede, and Callisto, but his idea didn’t catch on for more than 200 years. Scientists didn’t discover any more satellites around Jupiter until 1892 when American astronomer E.E. Barnard found Jupiter’s fifth moon Amalthea, much smaller than the Galilean moons and orbiting closer to the planet than Io. It was the last satellite in the solar system found by visual observation – all subsequent discoveries occurred via photography or digital imaging. As of today, astronomers have identified 95 moons orbiting Jupiter.
Image of Jupiter and three of its four Galilean satellites through an amateur telescope, similar to what Galileo might have seen. Hubble Space Telescope image of Jupiter and three of its four Galilean satellites during a rare triple transit. Although each of the Galilean satellites has unique features, such as the volcanoes of Io, the heavily cratered surface of Callisto, and the magnetic field of Ganymede, scientists have focused more attention on Europa due to the tantalizing possibility that it might be hospitable to life. In the 1970s, NASA’s Pioneer 10 and 11 and Voyager 1 and 2 spacecraft took ever increasingly detailed images of the large satellites including Europa during their flybys of Jupiter. The photographs revealed Europa to have the smoothest surface of any object in the solar system, indicating a relatively young crust, and also one of the brightest of any satellite indicating a highly reflective surface. These features led scientists to hypothesize that Europa is covered by an icy crust floating on a subsurface salty ocean. They further postulated that tidal heating caused by Jupiter’s gravity reforms the surface ice layer in cycles of melting and freezing.
Image of Europa taken by Pioneer 10 during its flyby of Jupiter in 1973. Image of Europa taken by Voyager 1 during its 1979 flyby of Jupiter. Image of Europa taken by Voyager 2 during its 1979 flyby of Jupiter. More detailed observations from NASA’s Galileo spacecraft that orbited Jupiter between 1995 and 2003 and completed 11 close encounters with Europa revealed that long linear features on its surface may indicate tidal or tectonic activity. Reddish-brown material along the fissures and in splotches elsewhere on the surface may contain salts and sulfur compounds transported from below the crust and modified by radiation. Observations from the Hubble Space Telescope and re-analysis of images from Galileo revealed possible plumes emanating from beneath Europa’s crust, lending credence to that hypothesis. While the exact composition of this material is not known, it likely holds clues to whether Europa may be hospitable to life.
Global view of Europa from the Galileo spacecraft. More detailed views of varied terrain on Europa from Galileo. Cutaway illustration of Europa’s icy crust, subsurface ocean and possible vents that transport material to the surface. Future robotic explorers of Europa may answer some of the outstanding questions about this unique satellite of Jupiter. NASA’s Europa Clipper set off in October 2024 on a 5.5-year journey to Jupiter. After its arrival in 2030, the spacecraft will enter orbit around the giant planet and conduct 49 flybys of Europa during its four-year mission. Managed by the Jet Propulsion Laboratory in Pasadena, California, and the Applied Physics Laboratory at Johns Hopkins University in Baltimore, Maryland, Europa Clipper will carry nine instruments including imaging systems and a radar to better understand the structure of the icy crust. Data from Europa Clipper will complement information returned by the European Space Agency’s JUICE (Jupiter Icy Moon Explorer) spacecraft. Launched in April 2023, JUICE will first enter orbit around Jupiter in 2031 and then enter orbit around Ganymede in 2034. The spacecraft also plans to conduct studies of Europa complementary with Europa Clipper’s. The two spacecraft should greatly increase our understanding of Europa and perhaps uncover new mysteries.
Illustration of the Europa Clipper spacecraft investigating Europa. Illustration of the JUICE spacecraft exploring Europa.European Space Agency. View the full article
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