Space and astronomy news
Large astronomical projects like the Dark Energy Survey and the James Webb Space Telescope provide innumerable benefits to society, like technological spin-offs, national prestige, and a way to satisfy our common human curiosity.
Continue reading “The Hidden Benefits of Large Science Projects”
In a recent study published in Science Advances, a team of researchers commissioned the Hobby-Eberly Telescope (HET), which is designed to study exoplanetary atmospheres, to examine how a “hot Jupiter” exoplanet is losing its helium atmosphere as it orbits its parent star, leaving tails of helium that extend approximately 25 times the diameter of the planet itself.
Continue reading “This Hot Jupiter is Leaving a Swirling Tail of Helium in its Wake”
Earth formed about 4.6 billion years ago. That simplistic statement is common, and it’s a good starting point for understanding our planet and our Solar System. But, obviously, Earth didn’t form all at once. The process played out for some period of time, and the usual number given is about 100 million years.
New research suggests that Earth formed more quickly than that in only a few million years.
Continue reading “Earth Might Have Formed in Just a Few Million Years”
The Theory of General Relativity (GR), proposed by Einstein over a century ago, remains one of the most well-known scientific postulates of all time. This theory, which explains how spacetime curvature is altered in the presence of massive objects, remains the cornerstone of our most widely-accepted cosmological models. This should come as no surprise since GR has been verified nine ways from Sunday and under the most extreme conditions imaginable. In particular, scientists have mounted several observation campaigns to test GR using Sagittarius A* (Sgr A*), the supermassive black hole at the center of the Milky Way.
Last year, the Event Horizon Telescope (EHT) – an international consortium of astronomers and observatories – announced they had taken the first images of Sag A*, which came just two years after the release of the first-ever images of an SMBH (M87). In 2014, the European members of the EHT launched another initiative known as BlackHoleCam to gain a better understanding of SMBHs using a combination of radio imaging, pulsar observations, astrometry, and GR. In a recent paper, the BHC initiative described how they tested GR by observing pulsars orbiting Sgr A*.
Continue reading “Pulsars Could Help Map the Black Hole at the Center of the Milky Way”
In the annals of “strange new worlds”, the ultra-hot Jupiter planet WASP-76b ranks right up there as a very unusual place. There’s no surface, but it does have a massive, hot atmosphere. Temperatures average a raging 2000 C and rise up to 2400 C in one hemisphere. That’s hot enough for mineral and rock-forming elements like calcium, nickel, and magnesium to get vaporized and float around in that thick blanket of air. Not only that, but iron probably rains down through the clouds.
Continue reading “A Planet So Hot Its Atmosphere Contains the Raw Material for Rocks”
The commercial spaceflight revolution didn’t begin with Elon Musk. Or with Jeff Bezos, or Richard Branson, or any of the other billionaires who’ve spent a fortune on the final frontier over the past 20 years.
Would you believe it began with Jules Verne in the 1860s?
That’s the perspective taken by Jeffrey Manber, one of the pioneers of the 21st-century spaceflight revolution, in a book tracing the roots of private-sector spaceflight to the French novelist.
“The first realistic steps taken in rocket development were because of a French science-fiction book,” Manber says in the latest episode of the Fiction Science podcast. “And that’s an underlying theme, in that we really needed a commercial ecosystem to get going. It’s not a government decree.”
It’s widely accepted that Earth’s plate tectonics are a key factor in life’s emergence. Plate tectonics allows heat to move from the mantle to the crust and plays a critical role in cycling nutrients. They’re also a key part of the carbon cycle that moderates Earth’s temperature.
But new research suggests that there was no plate tectonic activity when life appeared sometime around 3.9 billion years ago. Does this have implications for our search for habitable worlds?
Continue reading “Did Life Need Plate Tectonics to Emerge?”
PLD Space could launch its suborbital Miura-1 rocket this month.
Update: Game on… PLD Space has announced that they will attempt to launch Miura-1 tonight. The live webcast starts on June 17th (Saturday local time) at 1:00 AM Central European Time (11:00 PM Friday night on June 16th Universal Time, and 7:00 PM Eastern Daylight Saving Time), and the eight hour launch window begins at 2:00 AM CET/00:00UT/8:00 PM EDT.
A small space startup with big ambitions may be joining the private spaceflight club soon. This summer, Elche Spain-based PLD Space is set to carry out the first test launch of their single stage, suborbital Miura-1 rocket.
Continue reading “Startup PLD Space to Launch Europe’s First Reusable Rocket”
A few days ago I wrote about the search for Population III stars. These stars were the first stars of the universe. Giant beasts hundreds of times more massive than the Sun, composed only of hydrogen and helium. These massive stars would have been very short-lived, exploding as brilliant supernovae in less than a million years. But Population III stars were so massive, their supernovae were uniquely different from the ones we see today, so our best way to find evidence of them is to look for their supernova remnants. And a recent study published in Nature may have found some.
Continue reading “More Evidence of Massive First Generation Stars”
On Earth, a single solar day lasts 24 hours. That is the time it takes for the Sun to return to the same place in the sky as the day before. The Moon, Earth’s only natural satellite, takes about 27 days to complete a single circuit around our planet and orbits at an average distance of 384,399 km (~238,854.5 mi). Since time immemorial, humans have kept track of the Sun, the Moon, and their sidereal and synodic periods. To the best of our knowledge, the orbital mechanics governing the Earth-Moon system have been the same, and we’ve come to take them for granted.
But there was a time when the Moon orbited significantly closer to Earth, and the average day was much shorter than today. According to a recent study by a pair o researchers from China and Germany, an average day lasted about 19 hours for one billion years during the Proterozoic Epoch – a geological period during the Precambrian that lasted from 2.5 billion years to 541 million years ago. This demonstrates that rather than gradually increasing over time (as previously thought), the length of a day on Earth remained constant for an extended period.
Continue reading “A Day on Earth Used to Only Be 19 Hours”