Space and astronomy news
Things were pretty wet back on Mars about three and a half billion years ago. You wouldn’t know that by looking at the planet today. But, would you believe a megatsunami happened there? It turns out that not one, but two of these rogue waves happened there some 3.4 billion years ago.
Continue reading “Evidence of a Megatsunami on Mars”
The growing population of communication satellites such as Starlink and OneWeb is posing challenges for Earth-based astronomy facilities. Since such constellations will not be going away soon, astronomers want to find ways to work around the issue.
It’s not going to be easy, considering that thousands and thousands of low-Earth satellites (LEOsats) could potentially be placed in low-Earth orbit in the next few years. So, what are the solutions?
Continue reading “Ground Telescopes can Adapt to Satellite Megaconstellations if They get Accurate Telemetry Data”
When it comes to “on the ground” exploration of Mars, rovers make pretty good advance scouts. From Pathfinder to Perseverance, we’ve watched as these semi-autonomous robots do what human explorers want to do in the future. Now, engineers are studying ways to expand rover exploration on Mars. One thing they’re thinking about: communication satellite constellations for Mars surface navigation.
Continue reading “With a Small Network of Satellites Around Mars, Rovers Could Navigate Autonomously”
A sleeping giant of a volcano woke up this past week on the Big Island of Hawaii. Mauna Loa, which last erupted in the early 1980s, has been rattling the island with earthquakes for weeks. Finally, on November 27th, the mountain opened up. Not only did residents see this eruption, but NASA and NOAA satellites captured an infrared view of it.
Continue reading “Mauna Loa is Erupting for the First Time in 40 Years. Here’s What it Looks Like From Space.”
It seems our nighttime skies are hosting another new communications network. In recent years, we’ve seen Starlink trains of satellites moving against the backdrop of stars, and more OneWeb satellites will soon be heading to orbit. Now, it’s BlueWalker 3, a prototype test satellite for a new communications constellation aimed at cell phones. Think of it as the first of many “cell towers in space” providing communications access for people around the globe.
Continue reading “BlueWalker 3 is a Cellphone Tower in Space and One of the Brightest Objects Ever Launched. Astronomers Aren’t Happy.”
There’s a little galaxy in the Milky Way’s cosmic neighborhood called Leo 1. It’s a dwarf spheroidal that lies less than a million light-years away from us. Surprisingly, it has a supermassive black hole about the same mass as Sagittarius A* in our galaxy. That’s unusual in several ways, and astronomers want to know more about it.
Continue reading “The Second-Closest Supermassive Black Hole Might be in a Nearby Dwarf Galaxy”
NASA’s JWST data just keeps on delivering amazing discoveries. Back in July, it observed the exoplanet WASP-39 b and found fingerprints of atoms and molecules and active chemical reactions in its clouds. Now, a team of scientists extends that discovery with a much deeper analysis of the data.
Continue reading “JWST Detects Signs of Active Chemistry and Clouds in the Atmosphere of Exoplanet WASP-39 b”
Our galaxy’s stellar halo is giving astronomers some new food for thought. It turns out everyone thought the halo was spherical. But, it’s not. That’s news to everyone who said it was spherical. According to a new measurement done by a team at Harvard-Smithsonian Center for Astrophysics, it has a tilted, oblong football shape. This all tells astronomers an interesting tale about our galaxy’s ancient history.
Continue reading “The Milky Way’s Stellar Halo Isn’t a Sphere After All”
The process of star birth begins in a shroud of gas and dust. Hubble Space Telescope (HST) excels in showing detailed views of these stellar crêches because there’s still a lot to learn about them. Its latest image shows an object called a “dense core”, where a stellar embryo could already exist.
Continue reading “Hubble Sees a Dense Cloud of Gas and Dust That’s About to Become a Star”
NASA’s rolling geology robot shared a great image of sandstone that it found on Mars in Jezero Crater. It’s in a region called “Yori Pass”, which is part of an ancient river delta. Perseverance will take rock samples there for the upcoming Sample Return Mission. They should tell more about what happened with water in this region. And maybe they’ll show evidence of life.
Continue reading “Perseverance has Found a Nice Patch of Sandstone on Mars”