Researchers have discovered traces of ancient oceans in meteorites which were found in 1984, the 4-billion-year old fragments contain organic compounds which are “key ingredients of life”.
Circa 2017
Arizona State University engineer Panagiotis Artemiadis is developing technology that allows a pilot to control multiple drones using just their thoughts.
The journey took a very long time—505 days to fly 26,000 miles (42,000 km) at an average speed of about 45 mph (70 kph)—but pilots Bertrand Piccard and Andre Borschberg successfully landed the Solar Impulse 2 aircraft in Abu Dhabi on Tuesday, after flying around the world using only the power of the Sun. Solar Impulse 2 is a solar-powered aircraft equipped with more than 17,000 solar cells that weighs only 2.4 tons with a wingspan of 235 ft (72 m). Technical challenges, poor flying conditions, and a delicate aircraft all contributed to the slow pace. Gathered here are images from the record-setting circumnavigation, undertaken to help focus the world’s efforts to develop renewable energy sources.
Moderna Therapeutics has just entered phase two of its clinical trials. Here’s how mRNA vaccines work and what the latest developments mean.
The standard formulation of quantum theory relies on a fixed space-time metric determining the localisation and causal order of events. In general relativity, the metric is influenced by matter, and is expected to become indefinite when matter behaves quantum mechanically. Here, we develop a framework to operationally define events and their localisation with respect to a quantum clock reference frame, also in the presence of gravitating quantum systems. We find that, when clocks interact gravitationally, the time localisability of events becomes relative, depending on the reference frame. This relativity ia a signature of an indefinite metric, where events can occur in an indefinite causal order. Even if the metric is indefinite, for any event we can find a reference frame where local quantum operations take their standard unitary dilation form. This form is preserved when changing clock reference frames, yielding physics covariant with respect to quantum reference frame transformations.
Lassina Zerbo, head of body monitoring test ban treaty, responds to White House discussions about potential first US test for 28 years.
Julian Borger in Washington.
TUNGUSKA: Giant skipping iron stone?
Scientists have a new explanation for an explosive cosmic event in 1908 that flattened trees for hundreds of miles in a remote Siberian forest.
This week at NASA:
🚀 Preparing to #LaunchAmerica 🛰️ JAXA’s spacecraft delivers cargo to the International Space Station 🕵️♂️ The detective capabilities of NASA’s Perseverance Mars Rover.
Like biological brains, artificial neural networks may depend on slow-wave sleep for learning.
