Matt Williams, Author at Universe Today

February 23, 2020February 23, 2020 by Matt Williams

Who was Aristotle?

Credit: Lysippos - Jastrow/Wikipedia Commons

Philosopher, polymath, educator, synthesist, founder. These are just some of the words used to describe Aristotle, the 4th century BCE Greek luminary who (along with Plato) is known as the “father of Western philosophy.” With subjects ranging from physics, biology, and astronomy to logic, ethics, politics, and metaphysics, there is scarcely any field of study or subject that he did not have a significant and lasting impact on.

In fact, within the realm of astronomy and physics, Artistotle would be one of the leading authorities whose work would be considered canon for over two thousand years after his death. From Classical Antiquity to the Roman Empire to the Middle Ages and the Rennaissance, Aristotle would be considered the authoritative source on countless subjects.

February 23, 2020February 23, 2020 by Matt Williams

Solar Orbiter is Already Starting to Observe the Sun

Artist's impression of ESA's Solar Orbiter spacecraft. Credit: ESA/ATG medialab

On February 10th, 2020, the ESA’s Solar Orbiter (SolO) launched and began making its way towards our Sun. This mission will spend the next seven years investigating the Sun’s uncharted polar regions to learn more about how the Sun works. This information is expected to reveal things that will help astronomers better predict changes in solar activity and “space weather”.

Last week (on Thursday, Feb. 13th), after a challenging post-launch period, the first solar measurements obtained by the SolO mission reached its international science teams back on Earth. This receipt of this data confirmed that the orbiter’s instrument boom deployed successfully shortly after launch and that its magnetometer (a crucial instrument for this mission) is in fine working order.

February 20, 2020February 20, 2020 by Matt Williams

SETI Researchers Release Petabytes of Data in the Search For Aliens

Last week (Friday. Feb. 14th), the Breakthrough Listen Initiative released about 2 petabytes of optical and radio data that they have accumulated over the past four years. This is the second data release by the non-profit effort (as part of Breakthrough Initiatives) and the public is once again invited to search through the data for possible signs of extraterrestrial communications.

February 19, 2020February 19, 2020 by Matt Williams

Salt Water Might Still be Able to Collect on the Surface of Mars a Few Days a Year

The dark, narrow streaks flowing downhill on Mars at sites such as this portion of Horowitz Crater are inferred to be formed by seasonal flow of water on modern-day Mars. The streaks are roughly the length of a football field. These dark features on the slopes are called "recurring slope lineae" or RSL. The imaging and topographical information in this processed view come from the High Resolution Imaging Science Experiment (HiRISE) camera on NASA's Mars Reconnaissance Orbiter. Credit: NASA/JPL-Caltech/Univ. of Arizona

Billions of years ago, Mars had liquid water on its surface in the form of lakes, streams, and even an ocean that covered much of its northern hemisphere. The evidence of this warmer, wetter past is written in many places across the landscape in the form of alluvial fans, deltas, and mineral-rich clay deposits. However, for over half a century, scientists have been debating whether or not liquid water exists on Mars today.

According to new research by Norbert Schorghofer – the Senior Scientist at the Planetary Science Institute – briny water may form intermittently on the surface of Mars. While very short-lived (just a few days a year), the potential presence of seasonal brines on the Martian surface would tell us much about the seasonal cycles of the Red Planet, as well as help to resolve one of its most enduring mysteries.

February 19, 2020February 19, 2020 by Matt Williams

A New Technique to Make Lighter Radiation Shielding For Spacecraft: Rust.

2007-08-11 - The Canadian Space Agency (CSA) Astronaut Dave Williams performs a spacewalk during Shuttle Mission STS-118. Credit: © Canadian Space Agency/NASA

One of the biggest challenges of working and living in space is the threat posed by radiation. In addition to solar and cosmic rays that are hazardous to astronauts’ health, there is also ionizing radiation that threatens their electronic equipment. This requires that all spacecraft, satellites, and space stations that are sent to orbit be shielded using materials that are often quite heavy and/or expensive.

Looking to create alternatives, a team of engineers came up with a new technique for producing radiation shielding that is lightweight and more cost-effective than existing methods. The secret ingredient, according to their recently-published research, is metal oxides (aka. rust). This new method could have numerous applications and lead to a significant drop in the costs associated with space launches and spaceflight.

February 18, 2020February 19, 2020 by Matt Williams

There Could be Meteors Traveling at a Fraction of the Speed of Light When They Hit the Atmosphere

Multi-photo composite showing Perseid meteors shooting from their radiant point in the constellation Perseus. Earth crosses the orbit of comet 109P/Swift-Tuttle every year in mid-August. Debris left behind by the comet burns up as meteors when it strikes our upper atmosphere at 130,000 mph. Credit: NASA

It’s no secret that planet Earth is occasionally greeted by rocks from space that either explode in our atmosphere or impact on the surface. In addition, our planet regularly experiences meteor showers whenever its orbit causes it to pass through clouds of debris in the Solar System. However, it has also been determined that Earth is regularly bombarded by objects that are small enough to go unnoticed – about 1 mm or so in size.

According to a new study by Harvard astronomers Amir Siraj and Prof. Abraham Loeb, it is possible that Earth’s atmosphere is bombarded by larger meteors – 1 mm to 10 cm (0.04 to 4 inches) – that are extremely fast. These meteors, they argue, could be the result of nearby supernovae that cause particles to be accelerated to sub-relativistic or even relativistic speeds – several thousand times the speed of sound to a fraction of the speed of light.

February 13, 2020February 13, 2020 by Matt Williams

Astronomers Simulated How the Universe Would Look Without Dark Matter

Since the 1960s, there has been a general consensus among astronomers and cosmologists that the majority of the Universe is made up of an invisible, mysterious mass (known as Dark Matter). While scientists still haven’t identified the candidate particle that makes up this mass, indirect tests and simulations have shown that Dark Matter must exist in order for the Universe to be the way it is.

In a fascinating twist, a team of European researchers conducted a simulation that looked at a Universe without Dark Matter. Using an alternative theory known as MOdified Newtonian Dynamics (MOND), the team created a computer simulation in which the galaxies were actually very similar to what we see in the Universe today. These findings could help to resolve one of the most enduring mysteries of modern cosmology.

February 12, 2020February 12, 2020 by Matt Williams

New Images of the “Golf Ball” Asteroid Pallas

New images of Pallas reveal a "golf ball asteroid" landscape. Credit: MIT/Marsset et al.

In 1802, German astronomer Heinrich Olbers observed what he thought was a planet within the Main Asteroid Belt. In time, astronomers would come to name this body Pallas, an alternate name for the Greek warrior goddess Athena. The subsequent discovery of many more asteroids in the Main Belt would lead to Pallas being reclassified as a large asteroid, the third-largest in the Belt after Ceres and Vesta.

For centuries, astronomers have sought to get a better look at Pallas to learn more about its size, shape, and composition. As of the turn of the century, astronomers had come to conclude that it was an oblate spheroid (an elongated sphere). Thanks to a new study by an international team, the first detailed images of Pallas have finally been taken, which reveal that its shape is more akin to a “golf ball” – i.e. heavily dimpled.

February 11, 2020February 11, 2020 by Matt Williams

Mars 2020 Will be The Third Time That NASA Has Tried to Send a Microphone to Mars

The microphone for the upcoming Mars mission will be attached to the SuperCam, seen here in this illustration zapping a rock with its laser. Credit: NASA/JPL-Caltech

This summer, between mid-July and early August, the Mars 2020 rover will launch, reaching Mars by February of 2021. Once it touched down in the Jezero Crater, it will carry on in the footsteps of its predecessor – the Curiosity rover. This will include searching for evidence of Mars’ past habitability and the possible existence of life (past and present), as well as a sample-return mission.

To accomplish these tasks, the Mars 2020 rover will be relying on an advanced suite of instruments. One of these is the SuperCam, which includes a camera, a laser, and spectrometers and is mounted to the rover’s mast (or “head”). Once operational, this instrument will be used to study the chemistry and mineralogy of Martian rocks and (with any luck) find evidence of fossilized microbial life on Mars.

February 11, 2020February 11, 2020 by Matt Williams

SpaceX is Thinking of Spinning Off Starlink and Taking it Public

In May of 2019, SpaceX launched the first batch of satellites that will make up its Starlink constellation, thus delivering on Musk’s promise to provide broadband internet access to the whole world. Since then, the company has conducted several launches of upgraded satellites with the intent of creating a constellation of 1,584 by 2024 and 2,200 by 2027.

According to the latest statements made by Gwynne Shotwell, SpaceX’s President and Chief Operations Officer (COO), the company is considering spinning off Starlink and making it a publicly-traded company in the coming years. The announcement was made on Thursday, Feb. 6th, at a private investor event hosted by JPMorgan Chase & Co. in Miami.