The McDonald Laser Ranging Station, near Fort Davis, Texas, USA, uses a laser to measure the distance between the Earth and the Moon to an accuracy of 1 cm (0.39 inches). It bounces a laser off reflective targets left on the lunar surface by three US Apollo missions and two Soviet Lunokhod missions. The distance between the centres of the Earth and the Moon is 385,000 km (239,000 miles), and the laser ranging has shown that the Moon is receding from the Earth at a rate of 3.8 cm (1.5 inches) per year. This is one of the most accurate distance measurements ever made.
A team of European researchers discovered a new high-pressure mineral in a lunar meteorite which is helping to explain what happens to materials within the extreme pressures of the Earth’s mantle.
The new mineral donwilhelmsite is the first high-pressure mineral found in meteorites with application for terrestrial sediments dragged deep into the Earth mantle by plate tectonics. Mainly composed of calcium, aluminum, silicon, and oxygen atoms, donwilhelmsite was discovered within the lunar meteorite Oued Awlitis 001 found in 2014 in the Western Sahara.
The meteorite is compositionally similar to rocks comprising the Earth’s continents. Eroded sediments from these continents are transported by wind and rivers to the oceans, and subducted into the Earth’s mantle as part of the dense oceanic crust. Once dragged to depths of about 460–700 km, their constituent minerals transform at high pressures and high temperatures existing at those depths into denser mineral phases, including the newly discovered mineral donwilhelmsite. In the terrestrial rock cycle, donwilhelmsite is therefore an important agent for transporting continental crustal sediments through the transition zone of the Earth’s mantle (460−700 km depth).
To mark the 20th anniversary of continuous habitation of the International Space Station, ESA commissioned two graphic artists to illustrate the Station from two perspectives. We spoke to the artists and asked them how they approached this challenge.
The International Space Station celebrates a huge milestone on 2 November 2020. For two decades, it has continuously hosted humans in space. Eighteen ESA astronauts have flown to the Station. Altogether, more than 240 crew members and visitors from 19 countries have visited the station and made it their temporary home.
A collaboration between five space agencies, the station has become a symbol of peaceful international cooperation. It represents the best of our space engineering capabilities as well as humankind’s pursuit of scientific knowledge and exploration.
This revolution has already started, with wealthy citizens building their own space programs and entrepreneurs building spacecraft on relatively tiny budgets.
This time it must be about people, not governments. Rather than a centrally controlled quasi-military government race to space by two superpowers, we must enable the people themselves to go where they want to go, to do there what they want. If governments decide to return to the Moon — as seems to be the case — it must be to build villages, not bases, and to do it as rapidly as possible, as it needs to be an immediate challenge, not a distant dream. And if some want to go to Mars or mine asteroids, they need to be seen as part of a new frontier community. Thus, with both public and private players doing what they do best where they want to do it, we can make it happen far faster than many might believe.
After all, wherever we go between here and Mars, the challenge this time is not as daunting as going from the Earth to the Moon was in 1961, when we went from knowing almost nothing about space to walking on the Moon in eight years. Since then we have 50 years of experience operating in space. And while we foundered for many years in the waters just off shore in Earth orbit, we’ve learned a lot, developed a vast tool kit and honed our ability to get there, keep people alive and get them back. Opening the new worlds of space is not a technological challenge, so much as it is psychological. It is a matter of decision.
The Frontier offers us new ways of living, new ways to save our world and new ways to work together. It is an anathema to the ideologies of ignorance and hate espoused by those who attack us, as it literally rises above such wars. Even as we roll up our sleeves to defeat those who would push us back into the dark ages we can be creating the age of light. We can look at our children and tell them they need not be afraid. Instead we can share with them a new dream of people working together to achieve something incredible.
Photographer Andrew McCarthy is known for shooting incredible astrophotography images from his backyard in Sacramento, California. He recently added two more jaw-dropping images to his portfolio: ultra-clear views of the International Space Station (ISS) crossing the Sun and Moon.
Given that the ISS whizzes across the Sun and Moon in less than a second from the perspective of someone on Earth, capturing a clear view of the transit is not an easy thing to do.
McCarthy first managed to capture the ISS transiting the Sun on Tuesday, October 6th.
Twenty straight years of life in space makes the ISS the ideal “natural laboratory” to understand how societies function beyond Earth.
The ISS is a collaboration between 25 space agencies and organisations. It has hosted 241 crew and a few tourists from 19 countries. This is 43% of all the people who have ever travelled in space.
As future missions to the Moon and Mars are planned, it’s important to know what people need to thrive in remote, dangerous and enclosed environments, where there is no easy way back home.
Astronomers say they’ll have to keep an eye on the near-Earth asteroid Apophis to see how much of a danger the space rock poses to our planet during a close pass in 2068.
Borrowing a page from high-energy physics and astronomy textbooks, a team of physicists and computer scientists at the U.S. Department of Energy’s Lawrence Berkeley National Laboratory (Berkeley Lab) has successfully adapted and applied a common error-reduction technique to the field of quantum computing.
In the world of subatomic particles and giant particle detectors, and distant galaxies and giant telescopes, scientists have learned to live, and to work, with uncertainty. They are often trying to tease out ultra-rare particle interactions from a massive tangle of other particle interactions and background “noise” that can complicate their hunt, or trying to filter out the effects of atmospheric distortions and interstellar dust to improve the resolution of astronomical imaging.
Also, inherent problems with detectors, such as with their ability to record all particle interactions or to exactly measure particles’ energies, can result in data getting misread by the electronics they are connected to, so scientists need to design complex filters, in the form of computer algorithms, to reduce the margin of error and return the most accurate results.
