Universe Today

February 13, 2022February 6, 2022 by Paul M. Sutter

Astronomy Jargon 101: Heliosphere

NASA's Voyager 2 Probe Enters Interstellar Space This illustration shows the position of NASA's Voyager 1 and Voyager 2 probes, outside of the heliosphere, a protective bubble created by the Sun that extends well past the orbit of Pluto. Voyager 1 exited the heliosphere in August 2012. Voyager 2 exited at a different location in November 2018. Credit: NASA/JPL-Caltech

In this series we are exploring the weird and wonderful world of astronomy jargon! You’ll push the boundaries with today’s topic: the heliosphere!

February 12, 2022February 12, 2022 by Matt Williams

A THIRD Planet Found Orbiting Nearby Proxima Centauri

This artist’s impression shows Proxima d, a planet candidate recently found orbiting the red dwarf star Proxima Centauri, the closest star to the Solar System. The planet is believed to be rocky and to have a mass about a quarter that of Earth. Two other planets known to orbit Proxima Centauri are visible in the image too: Proxima b, a planet with about the same mass as Earth that orbits the star every 11 days and is within the habitable zone, and candidate Proxima c, which is on a longer five-year orbit around the star.

In August of 2016, astronomers with the European Southern Observatory (ESO) announced that they had discovered an exoplanet orbiting in neighboring Proxima Centauri. Based on Radial Velocity measurements (aka. Doppler Photometry), the discovery team estimated that the planet was roughly the same size and mass as Earth and orbited with Proxima Centauri’s Circumsolar Habitable Zone (HZ). In 2020, this planet was confirmed by follow-up observations.

In that same year, a second exoplanet (Proxima c) roughly seven times the mass of Earth (a Super-Earth or mini-Neptune) was confirmed. As if that wasn’t enough, an international team of astronomers with the ESO recently announced that they detected a third exoplanet around Proxima Centauri – Proxima d! This Mars-sized planet orbits about halfway between its host star and Proxima b and is one of the lightest exoplanets ever discovered.

February 12, 2022February 12, 2022 by Nancy Atkinson

James Webb’s First Pictures are Out! But it’s a Work in Progress

Webb sees its first star 18 times. Credit: NASA/ESA/CSA/STScI

Scientists from the James Webb Space Telescope shared the first images from space taken by the new telescope. Since the 18-segment mirror is in the early stages of being aligned, the first image is understandably blurry and a bit jumbled. But its exactly what the team wanted to see.

February 12, 2022February 6, 2022 by Paul M. Sutter

Astronomy Jargon 101: Gravitational Lens

dark matter shown in blue — This image from the NASA/ESA Hubble Space Telescope shows the galaxy cluster MACS J0416. This is one of six clusters that was studied by the Hubble Frontier Fields programme, which yielded the deepest images of gravitational lensing ever made. Scientists used intracluster light (visible in blue) to study the distribution of dark matter within the cluster.

In this series we are exploring the weird and wonderful world of astronomy jargon! You’ll be seeing double with today’s topic: gravitational lens!

February 11, 2022February 11, 2022 by Evan Gough

We Might Know Why Mars Lost its Magnetic Field

This figure shows a cross-section of the planet Mars revealing an inner, high density core buried deep within the interior. Dipole magnetic field lines are drawn in blue, showing the global scale magnetic field that one associates with dynamo generation in the core. Mars must have one day had such a field, but today it is not evident. Perhaps the energy source that powered the early dynamo has shut down. The differentiation of the planet interior - heavy elements like iron sinking towards the center of the planet - can provide energy as can the formation of a solid core from the liquid. Credit: NASA/JPL/GSFC

Mars is a parched planet ruled by global dust storms. It’s also a frigid world, where night-time winter temperatures fall to -140 C (-220 F) at the poles. But it wasn’t always a dry, barren, freezing, inhospitable wasteland. It used to be a warm, wet, almost inviting place, where liquid water flowed across the surface, filling up lakes, carving channels, and leaving sediment deltas.

But then it lost its magnetic field, and without the protection it provided, the Sun stripped away the planet’s atmosphere. Without its atmosphere, the water went next. Now Mars is the Mars we’ve always known: A place that only robotic rovers find hospitable.

How exactly did it lose its magnetic shield? Scientists have puzzled over that for a long time.

February 11, 2022February 11, 2022 by Matt Williams

Astronomers Measure the Layers of an Exoplanet's Atmosphere

An artist's conception of the hot Jupiter WASP-79b. (Image credit: NASA)

The number of planets discovered beyond our Solar System has grown exponentially in the past twenty years, with 4,919 confirmed exoplanets (and another 8,493 awaiting confirmation)! Combined with improved instruments and data analysis, the field of study is entering into an exciting new phase. In short, the focus is shifting from discovery to characterization, where astronomers can place greater constraints on potential habitability.

In particular, the characterization of exoplanet atmospheres will allow astronomers to determine their chemical makeup and whether they have the right characteristics to support life. In a new study led by the University of Lund, an international team of researchers characterized the atmosphere of one of the most extreme exoplanets yet discovered. This included discerning what could be several distinct layers that have particular characteristics.

February 11, 2022February 11, 2022 by David Dickinson

UAE’s Mars Hope Team Publishes ‘Mars Atlas’

The United Arab Emirates Space Agency releases a unique comprehensive Mars Atlas of the Red Planet.

You have never seen Mars like this. Recently, the New York University of Abu Dhabi (NYUAD) released an 88-page look at Red Planet, dubbed The Atlas of Mars. The Atlas is free online, and uses spectacular imagery taken from the United Arab Emirates Space Agency’s ambitious Mars Hope mission.

February 11, 2022February 6, 2022 by Paul M. Sutter

Astronomy Jargon 101: Neutrinos

Neutrino detection by the Kamioka Observatory. Credit: Kamioka Observatory/ICRR/The University of Tokyo

In this series we are exploring the weird and wonderful world of astronomy jargon! You’ll barely be able to see today’s topic: neutrinos!

February 11, 2022February 11, 2022 by Alan Boyle

Elon Musk Takes the Long View in Glitzy Update on SpaceX’s Starship Super-Rocket

SpaceX's Starship and Super Heavy booster stand tall on the Starbase launch pad in Texas. Source: SpaceX via YouTube

SpaceX CEO Elon Musk delivered a long-awaited, live-streamed update on his plans for launching the world’s most powerful rocket, with the spotlighted backdrop of a freshly stacked Starship and Super Heavy booster standing on the launch pad at the company’s Starbase facility in South Texas.

The Starship project is key to Musk’s plans to send thousands of settlers to Mars and make humanity a multiplanet species. It’s also key to his plans to put thousands of satellites in Earth orbit for SpaceX’s Starlink broadband network, which is supposed to bring in the money needed for Mars missions.

And as if all that’s not enough, Musk expects Starship to revolutionize space travel and society in ways that can’t be foreseen. “When you have an utterly profound breakthrough, the use cases will be hard to imagine,” he told hundreds of attendees during the Feb. 10 presentation at the Boca Chica base.

Musk exhibited his trademark optimism about the launch system’s development schedule, saying that the Federal Aviation Administration could give its go-ahead for the first Starship orbital launch from Texas as soon as next month. But he said there was a Plan B in case that approval didn’t come soon.

February 10, 2022February 10, 2022 by Matt Williams

Could Astronauts Hibernate on Long Space Voyages?

A renewed era of space exploration is upon us, and many exciting missions will be headed to space in the coming years. These include crewed missions to the Moon and the creation of permanent bases there. Beyond the Earth-Moon system, there are multiple proposals for crewed missions to Mars and beyond. This presents significant challenges since a one-way transit to Mars can take six to nine months. Even with new propulsion technologies like nuclear rockets, it could still take more than three months to get to Mars.

In addition to the physical and mental stresses imposed on the astronauts by the duration and long-term exposure to microgravity and radiation, there are also the logistical challenges these types of missions will impose (i.e., massive spacecraft, lots of supplies, and significant expense). Looking for alternatives, the European Space Agency (ESA) is investigating hibernation technology that would allow their astronauts to sleep for much of the voyage and arrive at Mars ready to explore.