The DownlinkApr 25, 2025

When we seek, we find

Space Snapshot

Donaldjohanson

Not many asteroids have been imaged up close, but that list just grew by one. NASA’s Lucy spacecraft flew past the asteroid Donaldjohanson on April 20, passing at a distance of just 960 kilometers (600 miles). Donaldjohanson orbits in the asteroid belt between Mars and Jupiter, and is thought to be a fragment of a larger asteroid that collided with another asteroid 150 million years ago. Lucy is continuing on from here and will reach its first main target in the Jupiter Trojan asteroid group in August 2027. Image credit: NASA / Goddard / SwRI / Johns Hopkins APL.

Fact Worth Sharing

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NASA’s Lucy spacecraft will end its mission in orbit around the Sun, meaning it could stay in the Solar System for millions of years. It carries a plaque as a time capsule, including messages from prominent thinkers of our time, in case future humans or visitors from elsewhere ever discover it.

Mission Briefings

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exoplanet

An exoplanet has been found orbiting two brown dwarfs at a perpendicular angle. Researchers using the European Southern Observatory’s Very Large Telescope have found the first evidence of a planet with a polar orbit around a pair of brown dwarfs (objects smaller than stars but larger than planets). Pictured: An illustration of the exoplanet’s perpendicular orbit around two brown dwarfs. Image credit: ESO / L. Calçada.

Mars

Curiosity may have found Mars’ missing carbonate. If Mars once had a thick, carbon dioxide-rich atmosphere and liquid surface water, like scientists think, signs of it should show up in Martian rocks as carbonate. The amounts predicted haven’t been found, but NASA’s Curiosity rover recently found evidence of the iron carbonate mineral siderite, potentially meaning carbonate may be hiding in other minerals as well.

exoplanet

Astronomers have found a disintegrating exoplanet with a comet-like tail. The planet orbits a star about 140 light years away at a distance 20 times closer than Mercury’s distance from the Sun. The data from NASA’s TESS telescope suggests that the planet has a tail of debris that stretches nearly half the length of its orbit, perhaps caused by magma boiling off its surface due to its proximity to the star.

Earth

The African Space Agency is now operational in Cairo, Egypt. This new international space agency, which has been in development since 2016, coordinates and implements space activities across several African nations and ensures access to space data and services across the continent. The agency’s permanent headquarters were officially inaugurated on April 20.

From The Planetary Society

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NASA needs you more than ever before. The President's 2026 budget request is expected to include a staggering 47% cut to NASA's science programs. Planetary Society Chief of Space Policy Casey Dreier wrote a guest essay in the New York Times this week unpacking what this would do to space science and exploration. You can help fight these cuts by sending a message to Congress and by supporting The Planetary Society in our efforts to oppose these budget cuts. Right now, every dollar you donate will have TWICE the impact thanks to a generous $75,000 matching gift challenge from a Planetary Society member. Help us meet the needs of this critical moment by making a gift nowPictured: An artist’s concept of Earth, the Moon, and Mars sharing space. Image credit: NASA.

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At the Cosmic Shores Gala, celebration, connection, and hope for the future. On April 5, The Planetary Society celebrated our 45th anniversary at the Cosmic Shores Gala. This event looked back on our history of space advocacy, and reaffirmed our commitment to defending space science. We also celebrated all those who make this work possible — from board members to major donors to the tens of thousands of members who support us around the world.

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The next book club meeting is coming up. On May 1, Planetary Society book club members can join a live virtual Q&A with astrophysicist Hakeem Oluseyi to discuss his book, "A Quantum Life: My Unlikely Journey from the Street to the Stars." The book traces Oluseyi's journey from an impoverished childhood and crime-filled adolescence to the top ranks of research physics. The book club is exclusive to Planetary Society members. Not yet a member? Join today.

Space-themed treasures are waiting for you!

Star trek cruise

Our 45th-anniversary online auction ends at the end of the day today, April 25. Get those last-minute bids in on a trip for 2 aboard the next Star Trek Cruise, a VIP tour of the Columbia Memorial Space Center, or a limited-edition commemorative 45th anniversary t-shirt.

What's Up

Mercury illustration

Before dawn, Mercury shines bright but very low to the eastern horizon, so it may be difficult to see. Yellowish Saturn is a bit higher up, with Venus above it. In the evening, look for very bright Jupiter high in the west, with reddish Mars higher up. Learn more in our guide to April’s night skies.

Carl Sagan. Bill Nye. You.

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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

Earthrise lunar orbiter

This week, people around the world celebrated our planet on Earth Day. This image, captured by NASA’s Lunar Orbiter 1 on August 23, 1966, was the first image taken of Earth from lunar orbit. It’s a good reminder that when we explore space, we see our planet in a different way — one that motivates us to appreciate and protect our home world. That wasn’t only true of these first forays into space; every mission of exploration sheds new light on Earth and our place in the Cosmos. It’s one of the many reasons why it’s vital that we keep exploring. Image credit: NASA / LOIRP.

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!