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Category: Astronomy/cosmology

The hidden magnetic universe begins to come into view

The hidden magnetic universe begins to come into view

Natalie Wolchover writes: Anytime astronomers figure out a new way of looking for magnetic fields in ever more remote regions of the cosmos, inexplicably, they find them. These force fields — the same entities that emanate from fridge magnets — surround Earth, the sun and all galaxies. Twenty years ago, astronomers started to detect magnetism permeating entire galaxy clusters, including the space between one galaxy and the next. Invisible field lines swoop through intergalactic space like the grooves of a…

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Pentagon is open to replacing base names linked to white supremacy, but Trump shuts down the discussion

Pentagon is open to replacing base names linked to white supremacy, but Trump shuts down the discussion

The New York Times reports: Monuments and memorials bearing the names of men who fought to preserve slavery and uphold white supremacy are facing a reckoning, as demonstrations against police brutality have erupted across the country in response to the killing of George Floyd by a Minneapolis police officer. The protests have also reignited a debate within the military community over 10 Army bases named after Confederate leaders, which as recently as February the service said it had no intention…

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The woman the Mercury astronauts couldn’t do without

The woman the Mercury astronauts couldn’t do without

Katherine Johnson died on February 24 at the age of 101. In 2016, Margot Lee Shetterly wrote: It had always been Katherine Goble’s great talent to be in the right place at the right time. In August 1952, 12 years after leaving graduate school to have her first child, that right place was in Marion, Virginia, at the wedding of her husband, Jimmy Goble’s, little sister Patricia. Pat, a vivacious college beauty queen just two months graduated from Virginia State…

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The strange influence the sun has on whales

The strange influence the sun has on whales

Ed Yong writes: The first clear evidence that some animals have a magnetic sense came from a simple-enough experiment—put an animal in a box, change the magnetic fields around it, and see where it heads. German scientists first tried this in the 1960s, with captive robins. When it came time to migrate, the birds would hop in a particular direction, as if they innately knew the way to fly. But when the team altered the magnetic fields around the robins’…

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How dark is the cosmic web?

How dark is the cosmic web?

Paul M. Sutter writes: The universe is permeated by a vast, invisible web, its tendrils weaving through space. But despite organizing the matter we see in space, this dark web is invisible. That’s because it is made up of dark matter, which exerts a gravitational pull but emits no light. That is, the web was invisible until now. For the first time, researchers have illuminated some of the darkest corners of the universe. A long time ago, the universe was…

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Do we live in a multiple universe?

Do we live in a multiple universe?

David J. Eicher writes: Decades of astrophysical research beginning in the late 19th century established the universe as we see it, culminating with the Big Bang theory. We now know the universe is about 13.8 billion years old and at least 150 billion trillion miles across. But in recent years, astronomers have begun to address a staggering possibility — the universe we can observe, and in which we live, may be one of many that makes up the cosmos. The…

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How far is it to the edge of the Universe?

How far is it to the edge of the Universe?

Ethan Siegel writes: If you were to go as far out into space as you can imagine, what would you encounter? Would there be a limit to how far you could go, or could you travel a limitless distance? Would you eventually return to your starting point, or would you continue to traverse space that you had never encountered before? In other words, does the Universe have an edge, and if so, where is it? Believe it or not, there…

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Could invisible aliens really exist among us? An astrobiologist explains

Could invisible aliens really exist among us? An astrobiologist explains

They probably won’t look anything like this. Martina Badini/Shutterstock By Samantha Rolfe, University of Hertfordshire Life is pretty easy to recognise. It moves, it grows, it eats, it excretes, it reproduces. Simple. In biology, researchers often use the acronym “MRSGREN” to describe it. It stands for movement, respiration, sensitivity, growth, reproduction, excretion and nutrition. But Helen Sharman, Britain’s first astronaut and a chemist at Imperial College London, recently said that alien lifeforms that are impossible to spot may be living…

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What makes us unexceptional

What makes us unexceptional

Corey S. Powell writes: One of the greatest debates in the long history of astronomy has been that of exceptionalism versus mediocrity—and one of the great satisfactions of modern times has been watching the arguments for mediocrity emerge triumphant. Far more than just a high-minded clash of abstract ideas, this debate has shaped the way we humans evaluate our place in the universe. It has defined, in important ways, how we measure the very value of our existence. In the…

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Supermassive black hole at the center of our galaxy may have a friend

Supermassive black hole at the center of our galaxy may have a friend

An artist’s conception of two black holes entwined in a gravitational tango. NASA/JPL-Caltech/SwRI/MSSS/Christopher Go By Smadar Naoz, University of California, Los Angeles Do supermassive black holes have friends? The nature of galaxy formation suggests that the answer is yes, and in fact, pairs of supermassive black holes should be common in the universe. I am an astrophysicist and am interested in a wide range of theoretical problems in astrophysics, from the formation of the very first galaxies to the gravitational…

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NASA’s Voyager 2 sends back its first signal from interstellar space

NASA’s Voyager 2 sends back its first signal from interstellar space

The Guardian reports: Twelve billion miles from Earth, there is an elusive boundary that marks the edge of the sun’s realm and the start of interstellar space. Voyager 2, the longest-running space mission, has finally beamed back a faint signal from the other side of that frontier, 42 years after its launch. The Nasa craft is the second ever to travel beyond the heliosphere, the bubble of supersonic charged particles streaming outwards from the sun. Despite setting off a month…

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The chemistry at the heart of the Universe

The chemistry at the heart of the Universe

Caleb A. Scharf writes: It’s a relatively little-known fact outside of astrophysics that the key to the first stars in the universe, and the earliest structures condensing out of the primordial murk, was chemistry. Specifically, the key was the formation of molecular hydrogen or H2. A pair of atoms bonded together and capable of rotating and vibrating. A few years ago I wrote about some of the details in this column. In brief, without the formation of molecular hydrogen it’s…

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The center of the Milky Way exploded just three million years ago — the recent past in galactic history

The center of the Milky Way exploded just three million years ago — the recent past in galactic history

Cosmos reports: A titanic, expanding beam of energy sprang from close to the supermassive black hole in the centre of the Milky Way just 3.5 million years ago, sending a cone-shaped burst of radiation through both poles of the Galaxy and out into deep space. That’s the finding arising from research conducted by a team of scientists led by Professor Joss Bland-Hawthorn from Australia’s ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D) and soon to…

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Living in space

Living in space

  By Paul Woodward To see things clearly, we often need to break the patterns of habit. The Earth, physically and metaphorically — the ground of human experience — is the stationary foundation that forms the background of movement: our movement across its surface; the terra firma against which the oceans wash and above which birds fly; the horizon that the Sun rises above and then falls beneath. Intellectually, as basic science, most people understand that it is the Earth…

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Giant, active galaxies from the early universe may have finally been found

Giant, active galaxies from the early universe may have finally been found

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Science News reports: Astronomers may finally have laid eyes on a population of enormous but elusive galaxies in the early universe. These hefty, star-forming galaxies are shrouded in dust, which hid them from previous searches that used starlight. Now observations of radiation emitted by that interstellar dust have revealed dozens of massive, active galaxies from when the universe was younger than 2 billion years, researchers report online August 7 in Nature. These galaxies may be the long-sought precursors to heavyweight…

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Most detailed ever 3D map of Milky Way shows ‘warped’ shape

Most detailed ever 3D map of Milky Way shows ‘warped’ shape

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The Guardian reports: The most detailed three-dimensional map yet of the Milky Way has been revealed, showing that our galaxy is not a flat disc but has a “warped” shape like a fascinator hat or a vinyl record that has been left in the sun. “The stars 60,000 light years away from the Milky Way’s centre are as far as 4,500 [light years] above or below the galactic plane – this is a big percentage,” said Dr Dorota Skowron of…

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