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Category: Astronomy/cosmology

First known interstellar object on Earth, scientists say

First known interstellar object on Earth, scientists say

Motherboard reports: An object from another star system crashed into Earth in 2014, the United States Space Command (USSC) confirmed in a newly-released memo. The meteor ignited in a fireball in the skies near Papua New Guinea, the memo states, and scientists believe it possibly sprinkled interstellar debris into the South Pacific Ocean. The confirmation backs up the breakthrough discovery of the first interstellar meteor—and, retroactively, the first known interstellar object of any kind to reach our solar system—which was…

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A bright star in the right place at the right time, provides a glimpse of the cosmic dawn

A bright star in the right place at the right time, provides a glimpse of the cosmic dawn

Science Alert reports: From billions of light-years across the vast gulf of space-time, from the very dawn of the Universe, astronomers have detected the light of a single star. Its discoverers have nicknamed it Earendel, from the Anglo-Saxon word meaning “morning star”; to date, it is the most distant object of its kind ever detected, dating to just 900 million years after the Big Bang. Because Earendel’s light has traveled so far to reach us, its properties are difficult to…

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An ancient solar calendar built by an unknown civilization

An ancient solar calendar built by an unknown civilization

Carly Cassella writes: Long before the Incas rose to power in Peru and began to celebrate their sun god, a little known civilization was building the earliest known astronomical observatory in the Americas. While not quite as old as sites like Stonehenge, these ancient ruins, known as Chankillo, are considered a “masterpiece of human creative genius“, holding unique features not seen anywhere else in the world. Based in the coastal desert of Peru, the archaeological site famously contains a row…

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Massive black holes shown to act like quantum particles

Massive black holes shown to act like quantum particles

Charlie Wood writes: When two black holes collide, the titanic crash ripples out through the very fabric of the cosmos. Physicists have used Albert Einstein’s theory of gravity to predict the rough contours of these gravitational waves as they pass through Earth, and wave after wave has been confirmed by the LIGO and Virgo gravitational-wave detectors. But physicists are starting to flounder as they attempt to use Einstein’s thorny equations to extract ultra-precise shapes of all possible reverberations. These currently…

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What we can learn about the universe from just one galaxy

What we can learn about the universe from just one galaxy

Rivka Galchen writes: Imagine if you could look at a snowflake at the South Pole and determine the size and the climate of all of Antarctica. Or study a randomly selected tree in the Amazon rain forest and, from that one tree—be it rare or common, narrow or wide, young or old—deduce characteristics of the forest as a whole. Or, what if, by looking at one galaxy among the hundred billion or so in the observable universe, one could say…

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A large solar storm could knock out the power grid and the internet – an electrical engineer explains how

A large solar storm could knock out the power grid and the internet – an electrical engineer explains how

Typical amounts of solar particles hitting the earth’s magnetosphere can be beautiful, but too much could be catastrophic. Svein-Magne Tunli – tunliweb.no/Wikimedia, CC BY-NC-SA By David Wallace, Mississippi State University On Sept. 1 and 2, 1859, telegraph systems around the world failed catastrophically. The operators of the telegraphs reported receiving electrical shocks, telegraph paper catching fire, and being able to operate equipment with batteries disconnected. During the evenings, the aurora borealis, more commonly known as the northern lights, could be…

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Peptides on stardust may have provided a shortcut to life

Peptides on stardust may have provided a shortcut to life

Yasemin Saplakoglu writes: Billions of years ago, some unknown location on the sterile, primordial Earth became a cauldron of complex organic molecules from which the first cells emerged. Origin-of-life researchers have proposed countless imaginative ideas about how that occurred and where the necessary raw ingredients came from. Some of the most difficult to account for are proteins, the critical backbones of cellular chemistry, because in nature today they are made exclusively by living cells. How did the first protein form…

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The Webb Space Telescope mission is working better than anyone could have predicted

The Webb Space Telescope mission is working better than anyone could have predicted

Marina Koren writes: The Webb telescope, named after a former NASA administrator, left Earth in a thundering launch from a rain-forest-ringed spaceport. The mood in town in the days before launch was cheery optimism, with an undercurrent of low-grade panic. When I asked the engineers and scientists there about the launch, they would make a bit of a nervous face before returning to a confident expression. The launch wasn’t the scary bit; Webb was riding on one of the most…

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One shot to see the universe like never before

One shot to see the universe like never before

Marina Koren writes: In the beginning, the universe was dark. The Big Bang had electrified the cosmos into existence, and the new landscape buzzed with particles, chaotic and hot, before cooling off into a calm expanse of hydrogen and helium. Then something began to happen in the fog. Gravity drove pockets of gas to collapse in on themselves and ignite, creating the first stars. The radiant orbs began to cluster, forming the first galaxies: messy, misshapen things, not as polished…

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Hubble takes amazing photos of the Prawn Nebula and a newborn star

Hubble takes amazing photos of the Prawn Nebula and a newborn star

Hubble takes amazing photos of the Prawn Nebula and a newborn star https://t.co/Ygw7VQ4skG — New Scientist (@newscientist) December 12, 2021 New Scientist reports: The above image shows the Prawn Nebula, a huge cloud of dust and gas often referred to as a stellar nursery because it acts as the birthplace for new stars. It is about 6000 light years from Earth and located in the Scorpius constellation, which is among the most prominent of the 88 constellations. The Prawn Nebula…

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The James Webb Space Telescope will rewrite cosmic history — if it works

The James Webb Space Telescope will rewrite cosmic history — if it works

Natalie Wolchover writes: To look back in time at the cosmos’s infancy and witness the first stars flicker on, you must first grind a mirror as big as a house. Its surface must be so smooth that, if the mirror were the scale of a continent, it would feature no hill or valley greater than ankle height. Only a mirror so huge and smooth can collect and focus the faint light coming from the farthest galaxies in the sky —…

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Scientists debate if cosmic pebbles create rocky planets like Earth

Scientists debate if cosmic pebbles create rocky planets like Earth

Jonathan O’Callaghan writes: Bob O’Dell wasn’t quite sure what he was looking at. It was 1992, and he had just got his hands on new images from the Hubble Space Telescope that zoomed in on young stars in the Orion Nebula. O’Dell had been hoping to study the nebula itself, an interesting region of star formation relatively close to Earth. Yet something else caught his attention. Several of the stars didn’t look like stars at all, but were instead enveloped…

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Mapping the heliosphere, which shields our solar system from harmful cosmic rays

Mapping the heliosphere, which shields our solar system from harmful cosmic rays

Virat Markandeya writes: David McComas has a favorite “astrosphere,” the environment created by a star’s stellar wind as it buffets the surrounding interstellar medium. It belongs to a star named Mira. In an image from 2006, Mira is heading to the right, at 291,000 miles an hour, five times the speed our sun ambles through its local interstellar cloud in the Milky Way. You can make out a “bow shock” forming ahead of the star, like one would ahead of…

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Could asteroids have supplied enough water to fill Earth’s oceans?

Could asteroids have supplied enough water to fill Earth’s oceans?

Physics Today reports: Three-quarters of the asteroids orbiting the Sun are of the carbon-rich C-type, whose significant freight of hydrated minerals has a similar ratio of deuterium to hydrogen as the water in Earth’s oceans. Asteroids of all types were far more abundant when Earth’s oceans formed around 4.6 billion years ago. Unsurprisingly, asteroids are a leading contender for the source of Earth’s water. But how many of those ancient asteroids could have found themselves in orbits that sent them…

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Is the universe open-ended?

Is the universe open-ended?

Caleb Scharf writes: One of my favorite albeit heavily paraphrased quotes from Albert Einstein is his assertion that the most incomprehensible thing about the universe is that it is comprehensible. (What he actually said, in his 1936 work “Physics and Reality,” is more longwinded, and includes a digression into Immanuel Kant and the meaning of “comprehensibility,” but he does write “… the eternal mystery of the world is its comprehensibility.”) In truth, this statement holds back a little. The greater…

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The day the dinosaurs died

The day the dinosaurs died

Douglas Preston writes: If, on a certain evening about sixty-­six million years ago, you had stood somewhere in North America and looked up at the sky, you would have soon made out what appeared to be a star. If you watched for an hour or two, the star would have seemed to grow in brightness, although it barely moved. That’s because it was not a star but an asteroid, and it was headed directly for Earth at about forty-five thousand…

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