The DownlinkAug 29, 2025

Are you ready for your close-up?

Space Snapshot

Inouye solar flare

The U.S. National Science Foundation’s Daniel K. Inouye Solar Telescope just released the sharpest-ever images of a solar flare. The above image shows an area about the size of four Earth diameters, showing fine structures in the lower solar atmosphere that had previously been too small to see. The observed coronal loops averaged 48.2 kilometers (30 miles) in width, with some potentially as narrow as 21 kilometers (13 miles) — the smallest ever imaged. Image credit: NSF/NSO/AURA.

Fact Worth Sharing

Sun illustration

Solar flares are sudden bursts of magnetic energy from the Sun that release electromagnetic radiation and charged particles into space. The radiation from a solar flare typically reaches Earth in about 8 minutes, whereas the particles take 1–3 days to arrive.

Special Note

The Downlink team is taking some time off next week, so we will not publish a newsletter on Sept. 5.

Mission Briefings

Bennu microscopic
Bennu

Bennu samples are yielding surprising discoveries. Samples returned from the asteroid by NASA’s OSIRIS-REx mission appear to contain a mixture of materials, including dust that formed in our Solar System, organic matter from interstellar space, and stardust that predates our Sun. Pictured: A scanning electron microscope image of a micrometeorite impact crater in a particle of asteroid Bennu material. Image credit: NASA/Zia Rahman.

small bodies

JAXA and ESA are teaming up on an asteroid mission. The Japanese space agency recently announced that it will provide the rocket for a European mission to observe the asteroid Apophis when it passes close to the Earth in 2029.

Earth

Calling all creative writers! The SETI Institute has announced the Cosmic Chronicles Literary Prize, a contest for emerging writers of all ages whose work explores questions of life, intelligence, and consciousness in the Universe. Learn more about the contest and how to submit your work.

small bodies

Ceres may have once been habitable. New analysis of data from NASA’s Dawn mission, which orbited the dwarf planet from 2015 to 2018, suggests that the bright, reflective regions on Ceres’ surface may consist of salts left over from liquid that came from an enormous reservoir of salty water below the surface.

small bodies

JWST has taken its first look at 3I/ATLAS. The space telescope’s near-infrared observations of the interstellar comet suggest that its coma contains the gases carbon dioxide, water, carbon monoxide, and carbonyl sulfide, in addition to water ice particles. They also suggest that it may have the highest ratio of carbon dioxide to water ever observed in a comet.

Venus

Juice is on track for a gravity-assist flyby of Venus after an anomaly. The European Space Agency’s Jupiter Icy Moons Explorer (Juice) mission briefly lost communication with Earth in July, but the mission team resolved that issue. The spacecraft will fly past Venus on Aug. 31 to adjust its speed and trajectory on its way to the Jupiter system.

From The Planetary Society

Serral
Planetary Society logo bullet

BASILISK is the first esports organization dedicated to promoting science. With some of the best gamers in the world on its team, BASILISK aims to inspire a passion for science among new audiences. Kyle Hill, head of science education and outreach for the team, joined this week’s Planetary Radio to talk about BASILISK’s unique mission and their new partnership with The Planetary Society and Caltech. Pictured: BASILISK team member Serral won the 2025 World Championship in Starcraft II. Image credit: BASILISK.

Planetary Society logo bullet

Sarah Al-Ahmed and Bruce Betts believe you can learn from playing video games. Two of The Planetary Society’s experts will join the PBS SoCal YouTube show “Won’t You Be My Gamer?” for a live-streamed gaming session while answering space science questions. Tune in at 7:00 p.m. ET on Sept. 3 to watch the live video.

Planetary Society logo bullet

Talking Mars science in Washington, D.C. Last week, The Planetary Society hosted a Mars exploration briefing on Capitol Hill. The discussion covered Mars exploration, how missions coordinate with one another, how NASA works with international partners, and how science itself drives new discoveries. We’re working every day to ensure policy experts understand why Mars exploration and space science deserve continued support.

Planetary Society logo bullet

Meet Dave Doody. In his over 40 years at the Jet Propulsion Lab, this celebrated engineer and designer has been a key contributor to the success of spacecraft, including Voyager, Magellan, and Cassini. He's now part of the Europa Clipper mission that will arrive at Jupiter in 2030. Dave joined a live Q&A in The Planetary Society’s online member community as part of our Planetary People interview series. You can watch a recording of the discussion here.

Planetary Society logo bullet

Next week in the Planetary Society book club: “Space Craze.” On Wednesday, Sept. 3, Margaret Weitekamp, curator at the Smithsonian's National Air and Space Museum, will join Planetary Society book club members for a discussion of her book, "Space Craze," which looks at how spaceflight has permeated American culture over the decades. Planetary Society members can join the live virtual Q&A in the member community. Not yet a member? Join today.

Planetary Society logo bullet

Tune into the 2025 NASA Innovative Advanced Concepts (NIAC) Symposium. This annual event showcases the ideas supported by NASA’s most forward-thinking program, which funds projects that push the boundaries of space science and technology. Planetary Radio’s Sarah Al-Ahmed will be hosting this year’s NIAC Symposium webcast, which you can watch live Sept. 9-11.

What's Up

Uranus illustration

This week, look for lots of planets in the predawn sky. Mercury is very low to the eastern horizon right before sunrise. Bright Venus shines higher up, with Jupiter and Saturn higher still. If you have binoculars or a telescope, you might also be able to see Uranus between Venus and Saturn, and a telescope might reveal Neptune close to Saturn.

Carl Sagan. Bill Nye. You.

Bill with founders

The Planetary Society was co-founded by Carl Sagan to give you an essential role in space exploration. Not already a member? Join today! When you become a member, you join a global community of space advocates who make a critical difference in supporting a future full of space exploration. Join CEO Bill Nye and become part of the world's most effective independent space advocacy nonprofit!

Wow of the Week

Artemis mascot finalist

There isn’t much room for whimsy when designing spacecraft to safely carry astronauts to and from space. But when the Artemis II mission launches for the Moon, it will carry a small plush item whose sole job is to float when the capsule enters microgravity, indicating to the astronauts that they’ve reached space. NASA held a public contest to design the zero-G indicator, and has narrowed submissions down to 25 finalists, including the cute little figure pictured above. The Artemis II crew themselves will choose which whimsical finalist will join them on their mission. Image credit: Lucas Ye/NASA.

Send us your artwork!

We love to feature space artwork in the Downlink. If you create any kind of space-related art, we invite you to send it to us by replying to any Downlink email or writing to [email protected]. Please let us know in your email if you’re a Planetary Society member!