Universe Today

March 8, 2024March 8, 2024 by Matt Williams

Satellite Measurements Show That Global Carbon Emissions are Still Rising

Tracking carbon emissions and sinks to determine Earth's annual Global Carbon Budget. Credit: NASA GEOS

According to the Intergovernmental Panel on Climate Change (IPCC) Sixth Assessment Report (AR6), human activities have significantly impacted the planet. As global greenhouse gas emissions (mainly carbon dioxide) have continued to increase, so too have global temperatures – with severe ecological consequences. Between 2011 and 2020, global surface temperatures rose by an estimated 1.07 °C (2.01 °F) above the average in 1850–1900. At this rate, temperatures could further increase by 1.5 to 2 °C (2.7 to 3.6 °F) in the coming decades, depending on whether we can achieve net zero by 2050.

Unfortunately, the data for the past year is not encouraging. According to the 2023 Global Carbon Budget (GCB), an annual assessment of Earth’s carbon cycle, emissions in 2023 continued to rise by 1.1 percent compared to the previous year. This placed the total fossil fuel emissions from anthropogenic sources at 36.8 billion metric tons (over 40 US tons) of carbon dioxide, with an additional 4.1 billion metric tons (4.5 US tons) added by deforestation, extreme wildfires, and other sources. This trend indicates we are moving away from our goals and that things will get worse before they get better!

March 8, 2024March 8, 2024 by Nancy Atkinson

Astronomers Image 62 Newly-Forming Planetary Systems

Planet-forming discs in three clouds of the Milky Way. Credit: ESO.

Astronomers using the Very Large Telescope in Chile have now completed one of the largest surveys ever to hunt for planet-forming discs. They were able to find dozens of dusty regions around young stars, directly imaging the swirling gas and dust which hints at the locations of these new worlds.

Just like the wide variety in the types of exoplanets that have been discovered, these new data and stunning images show how protoplanetary systems are surprisingly diverse, with different sizes and shapes of disks.

In research presented in three new papers, researchers imaged 86 young stars and found 62 of them had a wide range of star-forming regions surrounding them. The astronomers say this study provides a wealth of data and unique insights into how planets arise in different regions of our galaxy.

March 8, 2024March 14, 2024 by David Dickinson

Into Totality: Our Complete Guide to the April 8th Total Solar Eclipse Across North America

What to watch for on April 8^th as totality sweeps across the continent.

The time has come. Seven years ago on an August afternoon, the shadow on the Moon swept across the United States. Now we’re in the one month stretch, leading up to the big ticket astronomical event for 2024: the April 8^th total solar eclipse spanning North America.

March 7, 2024March 8, 2024 by Carolyn Collins Petersen

This Galaxy Was Already Dead When the Universe Was Only 700 Million Years Old

False-color JWST image of a small fraction of the GOODS South field, with the galaxy JADES-GS-z7-01-QU highlighted Credit: JADES Collaboration

When a galaxy runs out of gas and dust, the process of star birth stops. That takes billions of years. But, there’s a galaxy out there that was already dead when the Universe was only 700 million years old. What happened to it?

March 7, 2024March 7, 2024 by Evan Gough

Perseverance Sees Phobos, Deimos and Mercury Passing in Front of the Sun

NASA's Perseverance Mars rover used its Mastcam-Z camera to capture the silhouette of Phobos, the larger of Mars' pair of moons, as it passed in front of the Sun on Feb. 8, 2024, the 1,056th Martian day, or sol, of the mission. Image Credit: NASA/JPL-Caltech/ASU/MSSS/SSI

NASA’s Perseverance rover is busy exploring the Martian surface and collecting samples for eventual return to Earth. But the rover recently took some time to gaze upward and observe the heavens. Using Mastcam-Z, the rover’s primary science camera, Perseverance captured Phobos, Deimos, and Mercury as they transited in front of the Sun.

March 7, 2024March 7, 2024 by Andy Tomaswick

How Long Will Advanced Civilizations Try to Communicate With Us?

Technosignature research is heating up, with plenty of papers speculating on the nature, and sometimes the longevity, of signals created by technically advanced extraterrestrial civilizations. While we haven’t found any so far, that isn’t to say that we won’t, and a better understanding of what to look for would undoubtedly help. Enter a new paper by Amedeo Balbi and Claudio Grimaldi, two professors at the Universita di Roma Tor Vergata and the Ecole Polytechnique Federale de Lausanne, respectively. They have taken a statistical model to the problem of understanding how old a technosignature might be before we are likely to find it – and their answer is, surprisingly young.

March 7, 2024March 7, 2024 by Mark Thompson

One of the Oldest Astrolabes Has Both Hebrew and Arabic Markings

I always think of planispheres when I think of astrolabes! Navigators used these ancient devices (astrolabes not planispheres) to provide an accurate map of the stars in the sky. To use them you would match up the metal plates to the sky and you could calculate your location. Astrolabes date back to 220BC but one with Hebrew and Arabic markings was found and it is thought to have originated back in the 11th Century.

March 7, 2024March 7, 2024 by Andy Tomaswick

Drones Could Help Map the Lunar Surface with Extreme Precision

Exploring the Moon has become increasingly more of a focal point lately, especially with a series of landers recently launched with various degrees of success. One of the difficulties those landers and any future human missions face is understanding the terrain they are landing on and potentially traversing in the case of a rover or human. To help fight this problem, a team of researchers from Switzerland has developed a drone concept that could help map out some of the more interesting, potentially hazardous areas to explore on the Moon.

March 7, 2024March 7, 2024 by Mark Thompson

Perseverance is Keeping Track of the Big Picture While it’s Exploring Mars

It’s always a real benefit to have scientists on the ground, able to use the wealth of their experience and ingenuity to ‘think on their feet’. It is therefore always quite challenging to use space probes that to a degree need to be autonomous. This is certainly true of the NASA Perseverance Rover that has been drilling core samples that will one day (hopefully) be returned to Earth as part of the Mars Sample Return mission. Until then, a team of Geologists have developed a technique to calculate the orientation of the core samples to help with future analysis.

March 7, 2024March 7, 2024 by Nancy Atkinson

Now You Can See Exactly Where Hubble and JWST are Pointed

Graphics of the Hubble and James Webb Space Telescopes. Credit: NASA/STScI.

Hubble and JWST are busily scanning the sky, sending home enormous amounts of data. They shift from target to target, completing the required observations.

But have you ever wondered what those two space telescopes are doing right at this moment? Now, you can do just that at the new Space Telescope Live website. It will show you what each observatory is scanning, where the objects are in the sky, and what researchers hope to learn. You can even go back or forward in time and see what each telescope has been looking at in the past or what observations are coming up.