In a forward-looking article, George Church, Ph.D., from Harvard University and the Wyss Institute, proposes the use of picogram to nanogram-scale probes that can land, replicate, and produce a communications module at the destination to explore nearby stars. The new article is published in a special issue on "Interstellar Objects in Astrobiology" of Astrobiology.

"One design is a highly reflective light sail, traveling a long straight line toward the gravitational well of a destination star, and the photo-deflected to the closest non-luminous mass—ideally a planet or moon with exposed liquid water," states Dr. Church.

"Most living cells on Earth are picogram-scale and yet perform functions, such as replication from only simple chemical inputs, impossible for all current human-made machines," notes Dr. Church. He considers factors such as acceleration and deceleration, and how to build communications devices using some form of electromagnetic radiation. Environments suitable for microbial replication require appropriate temperature, chemicals, and energy sources.

"Clearly, a considerable amount of work remains for improving the theory, design, and testing aspects of this proposal, some of which can be done on Earth or within our home solar system," concludes Dr.

In May 2022, a SpaceX Falcon 9 rocket launched the Transporter-5 mission into orbit. The mission contained a collection of micro and nanosatellites from both industry and government, including one from MIT Lincoln Laboratory called the Agile MicroSat (AMS).

AMS's primary mission is to test automated maneuvering capabilities in the tumultuous very low-Earth orbit (VLEO) environment, starting at 525 kilometers above the surface and lowering down. VLEO is a challenging location for satellites because the higher air density, coupled with variable space weather, causes increased and unpredictable drag that requires frequent maneuvers to maintain position. Using a commercial off-the-shelf electric-ion propulsion system and custom algorithms, AMS is testing how well it can execute automated navigation and control over an initial mission period of six months.

"AMS integrates electric propulsion and autonomous navigation and guidance control algorithms that push a lot of the operation of the thruster onto the spacecraft—somewhat like a self-driving car," says Andrew Stimac, who is the principal investigator for the AMS program and the leader of the laboratory's Integrated Systems and Concepts Group.

The European Space Agency (ESA) recently announced a new mission of its science program: a small telescope orbiting the Earth dubbed Arrakhis. But although its name is inspired by the sci-fi novel Dune, it will not be looking for sandworms or "spice" on a desert planet.

Instead, this nimble satellite will punch hugely above its weight and try to track down one of the most elusive and mysterious substances in the universe: dark matter. This is the term given to the hypothetical invisible matter that is thought to be more abundant than normal matter and have a similar gravitational effect on its surroundings.

The mission is classified as fast (F), which means it is smaller, more focused and has a quicker turnaround (less than ten years to launch) than other types of ESA missions. The agency's previous F-mission, selected in 2019, is called the Comet Interceptor. Already parked at a stable point in the Solar System, this probe is waiting for a comet to show up and fly by it, something that's due to happen around the time that Arrakhis launches in the early 2030s.

The animation shows the full launch sequence for the first Meteosat Third Generation Imager (MTG-I1) satellite. MTG-I1 launches on an Ariane 5 rocket from Europe's Spaceport in Kourou, French Guiana.

MTG-I1 is the first of six satellites that form the full MTG system, which will provide critical data for weather forecasting over the next 20 years. In full operations, the mission will comprise two MTG-I satellites and one MTG Sounding (MTG-S) satellites working in tandem.

The MTG-I satellites carry two completely new instruments, a Flexible Combined Imager and Europe's first Lightning Imager, to deliver high-quality data for better weather forecasting.