May 19 2019

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Universe Today

Space and astronomy news

The World’s Glaciers are Down by 9 Trillion Tonnes of Ice in the Last Half Century

Things are not looking good for Earth’s glaciers. Usually, when it comes to climate change and melting ice, we think of the Earth’s polar regions. But they’re not the only important ice formations, and they’re not the only ice that’s melting due to climate change.

Metal Asteroid Psyche Might Have Had Volcanoes of Molten Iron

Imagine a time in the Solar System’s past where the asteroids were not solid rock, but blobs of molten iron. It sounds strange, but that may have been the case. And in the right conditions, some of those asteroids would have sprouted volcanoes. One of those asteroids, Psyche, is the destination for a NASA mission.

Messier 83 – the Southern Pinwheel Galaxy

Welcome back to Messier Monday! Today, we continue in our tribute to our dear friend, Tammy Plotner, by looking at the Southern Pinwheel Galaxy – also known as Messier 83!

During the 18th century, famed French astronomer Charles Messier noticed the presence of several “nebulous objects” while surveying the night sky. Originally mistaking these objects for comets, he began to catalog them so that others would not make the same mistake. Today, the resulting list (known as the Messier Catalog) includes over 100 objects and is one of the most influential catalogs of Deep Space Objects.

One of these objects is the Southern Pinwheel Galaxy (aka. Messier 83), a barred spiral galaxy located 15.21 million light years from Earth in the southern constellation Hydra. With a spatial diameter of about 55,000 light years, or roughly half the size of the Milky Way, M83 is one of the nearest and brightest barred spirals in the sky.

Hayabusa2 Fires an Anti-Tank Warhead at Asteroid Ryugu

Last week, the Japanese Aerospace Exploration Agency‘s (JAXA) dropped an explosive warhead on the surface of asteroid 162173 Ryugu. You might think this was the opening line of an entirely-readable science fiction novel, but it’s totally true. The operation began on April 4th, when the Hayabusa2 spacecraft sent its Small Carry-on Impactor (SCI) down to Ryugu’s surface and then detonated it to create a crater.

Ep. 525: 100 Years of the International Astronomical Union

Even though they might be scattered around our planet, astronomers have way to come together to work out issues that face their entire field of study. It’s called the International Astronomical Union, and they’re the ones who work out the new names for stars, and sometimes de-planet beloved Kuiper Belt Objects.
Continue reading “Ep. 525: 100 Years of the International Astronomical Union”

Now We Know That Dark Matter Isn’t Primordial Black Holes

For over fifty years, scientists have theorized that roughly 85% of matter in the Universe’s is made up of a mysterious, invisible mass. Since then, multiple observation campaigns have indirectly witnessed the effects that this “Dark Matter” has on the Universe. Unfortunately, all attempts to detect it so far have failed, leading scientists to propose some very interesting theories about its nature.

One such theory was offered by the late and great Stephen Hawking, who proposed that the majority of dark matter may actually be primordial black holes (PBH) smaller than a tenth of a millimeter in diameter. But after putting this theory through its most rigorous test to date, an international team of scientists led from the Kavli Institute for the Physics and Mathematics of the Universe (IPMU) has confirmed that it is not.

Mars Express Saw the Same Methane Spike that Curiosity Detected from the Surface of Mars

If you’re not a chemist, an astrobiologist, or a scientist of any sort, and that includes most of us, then a tiny, almost imperceptible whiff of methane in the Martian atmosphere might seem like no big deal. But it is, gentle humans. It is.

Because it could be a signal that some living process is at work. And even we non-scientists have wondered at some point if the only life in the Solar System, or maybe in the entire Universe, is confined here on Earth.

The Starhops Have Begun!

According to Elon Musk, SpaceX’s Starship Hopper just completed its inaugural hop test at the company’s South Texas Launch Site. As the first of many, this test is intended to validate the sophisticated Raptor engines that will be used aboard the full-scale Starship spacecraft, which is intrinsic to Musks’ long-term vision of providing intercontinental flights and making commercial trips to the Moon and Mars.

Carnival of Space #605

This week’s Carnival of Space is hosted by me at the CosmoQuest blog.

Weekly Space Hangout: Apr 3, 2019 – Dr. David Chudwin

David Chudwin, MD, is the author of the upcoming book I Was a Teenage Space Reporter: From Apollo 11 to Our Future in Space. Continue reading “Weekly Space Hangout: Apr 3, 2019 – Dr. David Chudwin”

Podcast (wshaudio): Download (Duration: 1:01:59 — 58.9MB)

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