Matt Williams, Author at Universe Today

December 20, 2020February 7, 2022 by Matt Williams

Beyond “Fermi’s Paradox” XIV: What is the Aurora Hypothesis?

Credit and Copyright: Stefan Payne-Wardenaar; Magellanic Clouds: Robert Gendler/ESO

Welcome back to our Fermi Paradox series, where we take a look at possible resolutions to Enrico Fermi’s famous question, “Where Is Everybody?” Today, we examine the possibility that the reason for the Great Silence is that colonizing other star systems is hazardous to our health!

In 1950, Italian-American physicist Enrico Fermi sat down to lunch with some of his colleagues at the Los Alamos National Laboratory, where he had worked five years prior as part of the Manhattan Project. According to various accounts, the conversation turned to aliens and the recent spate of UFOs. Into this, Fermi issued a statement that would go down in the annals of history: “Where is everybody?“

This became the basis of the Fermi Paradox, which refers to the disparity between high probability estimates for the existence of extraterrestrial intelligence (ETI) and the apparent lack of evidence. Since Fermi’s time, there have been several proposed resolutions to his question, which includes the Aurora Hypothesis that states that just because planets are habitable doesn’t mean that intelligent life can colonize there.

December 19, 2020December 19, 2020 by Matt Williams

Here are NASA’s Science Priorities for the Artemis Missions

View of the Earth rising above the lunar horizon, taken during the Apollo 11 mission. Credit: NASA

In October of 2024, NASA will send astronauts to the Moon for the first time since the Apollo Era. After establishing orbit with their Orion spacecraft, a team of two astronauts (“the first woman and the next man”) will land in the Moon’s southern polar region. Over the course of a week, these astronauts will explore and investigate one of the region’s many permanently-shadowed craters.

As the first crewed lunar mission in over fifty years, this mission and those that follow will have a robust series of science objectives. These objectives were laid out in the Artemis III Science Definition Team Report, which was released to the public earlier this month. This report is a summary of the science plan prepared at the behest of NASA’s Science Mission Directorate (SMD) for the Artemis III mission.

December 18, 2020December 18, 2020 by Matt Williams

Here’s Chang’e-5, Seen From Lunar Orbit

Credit: NASA/GSFC/Arizona State University

On Tuesday, December 1^st, at 10:11 EST (07:00 PST) the Chang’e-5 sample return spacecraft landed safely on the Moon. This mission is the latest in China’s lunar exploration program, which is paving the way for the creation of a lunar outpost and a crewed mission by the 2030s. The day after it landed, the Lunar Reconnaissance Orbiter (LRO) passed over the site and acquired an image of the lander.

December 18, 2020December 18, 2020 by Matt Williams

A Real River Valley on Mars, Filled With Virtual Water by @Kevinmgill

We are once again indebted to Kevin M. Gill, a science data visualization artist with a flair for the cosmos, for this beautiful rendering! The image first popped up on Kevin’s Twitter feed last week and can also be found (and downloaded) on his Flickr account. As he explained, the visual is his rendition of what the Hypanis Valles on Mars may have looked like back when water still flowed in the region. As he described it:

“A meandering river? Obvious and bad CGI? Based on a real place on Mars? All Three! Outflow location at Hypanis Valles With Flowing Water, via @HiRISE DTM data.”

December 17, 2020October 2, 2021 by Matt Williams

Chuck Yeager, the First Man to Break the Sound Barrier has Died. He was 97

Capt. Charles E. Yeager (shown standing next to the Air Force's Bell-built X-1 supersonic research aircraft) became the first man to fly faster than the speed of sound in level flight on October 14, 1947. (U.S. Air Force photo)

On Dec.7th, 2020, World War II flying ace and legendary test pilot General Chuck Yeager passed away while in hospital in Los Angeles. He was 97 years of age and is survived by his second wife, Victoria Yeager (nee Victoria Scott D’Angelo), and his three children, Susan, Don, and Sharon. Yeager is interred at Arlington National Cemetery outside of Washington D.C. with full military honors.

December 15, 2020December 15, 2020 by Matt Williams

The RAVN-X is a new Autonomous Aircraft Designed to Launch Small Satellites

In the past twenty years, one of the biggest developments to take place in the realm of space exploration has been the growth of the commercial space industry (aka. NewSpace). As a result of growing demand and declining costs, more companies are coming to the fore to offer launch services that are making space more accessible and cost-effective.

One such company is the space delivery services company Aevum, an Alabama-based startup specializing in Autonomous Launch Vehicles (AuLVs). On Dec. 3rd, 2020, Aevum unveiled their prototype vehicle, the RAVN-X. Once operational, this autonomous suborbital spaceplane will be able to send satellites and other small payloads to Low Earth Orbit (LEO) in just three hours.

December 13, 2020December 14, 2020 by Matt Williams

If We Used the Sun as a Gravitational Lens Telescope, This is What a Planet at Proxima Centauri Would Look Like

mage of a simulated Earth, at 1024×1024 pixel resolution, at the distance of Proxima Centauri,at 1.3 pc, as projectedby the SGL to an image plane at 650 AU from the Sun. Credit: Toth H. & Turyshev, S.G.

As Einstein originally predicted with his General Theory of Relativity, gravity alters the curvature of spacetime. As a consequence, the passage of light changes as it encounters a gravitational field, which is how General Relativity was confirmed! For decades, astronomers have taken advantage of this to conduct Gravitational Lensing (GL) – where a distant source is focused and amplified by a massive object in the foreground.

In a recent study, two theoretical physicists argue that the Sun could be used in the same way to create a Solar Gravitational Lens (SGL). This powerful telescope, they argue, would provide enough light amplification to allow for Direct Imaging studies of nearby exoplanets. This could allow astronomers to determine if planets like Proxima b are potentially-habitable long before we send missions to study them.

December 10, 2020December 10, 2020 by Matt Williams

That’s no Asteroid, it’s a Rocket Booster

Earthrise as photographed by the Apollo 10 crew in May 1969. Credit: NASA

Back in September, astronomers using the Panoramic Survey Telescope and Rapid Response System 1 (Pan-STARRS1) noticed an object in a distant orbit around Earth. Initially, the object (designed 2020 SO) was thought that be a near-Earth Asteroid (NEA). But based on the curious nature of it’s and the way solar radiation appeared to be pushing it off course, NASA scientists theorized that 2020 SO might be a spent rocket booster.

This was the tentative conclusion reached by staffers at the NASA Center for Near-Earth Object Studies (CNEOS) at NASA JPL. Specifically, they theorized that the object was the spent upper stage booster of the Centaur rocket that launched the Surveyor 2 spacecraft towards the Moon in 1966. This theory has since been confirmed thanks to new information provided by CNEOS and the NASA Infrared Telescope Facility (IRTF).

December 9, 2020December 10, 2020 by Matt Williams

SpaceX’s SN8 Starship Soars and Belly-Flops, but Fails to Stick the Landing. Oh Well, Bring on the SN9!

At long last, SpaceX has conducted the first high-altitude test flight with its prototype Starship vehicle! During the launch, the eighth iteration of their spacecraft (SN8) flew to an altitude of 12.5 km (~7.8 mi; 41,000 ft) and conducted some fancy maneuvers before returning to its landing pad. Unfortunately, the landing was a bit hot and the SN8 exploded as soon as it touched down.

Despite failing to make it home in one piece (technically it did, but then exploded), the SN8 validated the Starship design for high-altitude flight, a major stepping stone towards spaceflight. What’s more, the data they gathered from this test and the failed landing is already being used to prepare for the next flight. So really, this test was a very important milestone on the road to conducting regular flights to the Moon and Mars.

December 8, 2020December 8, 2020 by Matt Williams

You’re Going to Need a Bigger Drill. The Best Place for Life on Mars is Deep, Deep Underground

A vertically exaggerated, false-color view of a large, water-carved channel on Mars called Dao Vallis. Image: ESA/DLR/FU Berlin, CC BY-SA 3.0 IGO. 3D rendered and colored by Lujendra Ojha

For decades, robotic missions have been exploring Mars to learn more about the planet’s geological and environmental history. Next year, the Perseverance rover will join in the hunt and be the first mission to send samples back to Earth and by the 2030s, the first crewed mission is expected to take place. All of these efforts are part of an ongoing effort to find evidence of past (and maybe even present) life on Mars.

According to a new study from Rutgers University-New Brunswick., the most likely place to find this evidence is located several kilometers beneath the surface. It is here (they argue) that water still exists in liquid form, which is likely the result of geothermal heating melting thick subsurface sheets of ice. This research could help resolve lingering questions like the faint young Sun paradox.