Launching in August 2022 and arriving at the asteroid belt in 2026, NASA's Psyche spacecraft will orbit a world we can barely pinpoint from Earth and have never visited.

The target of NASA's Psyche mission—a metal-rich asteroid, also called Psyche, in the main belt between Mars and Jupiter—is an uncharted world in outer space. From Earth- and space-based telescopes, the asteroid appears as a fuzzy blur. What scientists do know, from radar data, is that it's shaped somewhat like a potato and that it spins on its side.

By analyzing light reflected off the asteroid, scientists hypothesize that asteroid Psyche is unusually rich in metal. One possible explanation is that it formed early in our solar system, either as a core of a planetesimal—a piece of a planet—or as primordial material that never melted. This mission aims to find out, and in the process of doing so, they expect to help answer fundamental questions about the formation of our solar system.

A federal agency on Monday granted a license for a launchpad that would fly commercial rockets from coastal Georgia.

The Federal Aviation Administration's approval of a launch site operator license for Spaceport Camden marks a significant milestone for the Georgia space project, though many reviews and permits are needed before any rockets can actually launch.

A Camden County leader said Monday that the project propels Georgia into the space race that's seen civilians and celebrities flown into space in recent months.

"This once in a generation opportunity will provide a new frontier of economic prosperity for Camden, the region and the state of Georgia," Steve Howard, Camden County Administrator and Spaceport Camden executive project lead, said in a statement after the FAA's decision was announced.

"Georgia is part of the new space race, and we will become one of the leaders," Howard added.

Even with the license, the FAA says that more comprehensive reviews would be needed before any rockets can be launched.

In its 36-page decision released Monday, the FAA said it considered potential impacts to the climate and environment, public comments, and the agency's responsibility to encourage and promote commercial space launches by the private sector.

"Sea level rise and other climatological changes, such as increase in extreme weather events, may affect the spaceport in the coming years," the FAA wrote in its report.

NASA plans to replace an engine controller aboard its massive SLS rocket after finding a communications glitch with the system's avionics during preflight testing, the latest setback in a program for which Boeing Co. is the main contractor and that has been plagued by years of delays and billions of dollars in costs beyond its initial budget.

The National Aeronautics and Space Administration also said Friday it will explore launch dates for a test flight in March and April.

The rocket, which Congress authorized and began funding in 2010, was supposed to fly in late 2016. In October, NASA solicited ideas from the aerospace industry about ways to lower the costs associated with the Space Launch System.

Replacing the unit on one of the SLS's four RS-25 engines is "the best course of action," the agency said. The update comes after engineers preparing the rocket for flight detected a communications problem last month between the rocket's avionics system and the No. 4 engine, and began troubleshooting the issue.

NASA plans to use the Space Launch System rocket and Orion crew capsule to return astronauts to the moon later this decade.

In science fiction stories about contact with extraterrestrial civilisations, there is a problem: What kind of propulsion system could make it possible to bridge the enormous distances between the stars? It cannot be done with ordinary rockets like those used to travel to the moon or Mars. Many more or less speculative ideas about this have been put forward—one of them is the "Bussard collector" or "Ramjet propulsion". It involves capturing protons in interstellar space and then using them for a nuclear fusion reactor.

Peter Schattschneider, physicist and science fiction author, has now analyzed this concept in more detail together with his colleague Albert Jackson from the USA. The result is unfortunately disappointing for fans of interstellar travel: it cannot work the way Robert Bussard, the inventor of this propulsion system, thought it up in 1960. The analysis has now been published in the scientific journal Acta Astronautica.

The hydrogen-collecting machine

"The idea is definitely worth investigating," says Prof. Peter Schattschneider. "In interstellar space there is highly diluted gas, mainly hydrogen—about one atom per cubic centimeter.