Astronomy physics and quantum physics
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Astronomy physics and quantum physics
There is no harm in doubt and skepticism, for it is through these that new discoveries are made
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Will we ever… travel faster than the speed of light?

Will we ever… travel faster than the speed of light? | Astronomy physics and quantum physics | Scoop.it

Einstein said it is impossible, but some scientists are still trying to break the cosmic speed limit – even if it means bending the laws of physics.

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Hot Exomoons should be easier to image than Exoplanets and may give us first glimpses of foreign Exoworlds

Hot Exomoons should be easier to image than Exoplanets and may give us first glimpses of foreign Exoworlds | Astronomy physics and quantum physics | Scoop.it

Moons, rather than planets, could star in the first images of foreign worlds outside our solar system. Once taken, such images would offer unprecedented clues to the moons' ability to support life by providing the chemical signatures carried in their light.

 

"If we can direct-image them, we can take their spectra, which means we can determine what sort of molecules are in their atmosphere," says Mary Anne Peters of Princeton University.

 

So far, more than 800 planets outside our solar system, or exoplanets, have been found using indirect methods, such as picking up the dimming of a star's light when a planet passes in front of it. But spectra from rocky planets similar in size to Earth have been tough to collect with these methods. The planetary photo album is even slimmer: only 4 systems have been imaged.

 

One challenge is that stars are bright whereas planets are dim, so a planet has to be far enough from its star to avoid being outshined. That means those worlds that have been imaged orbit outside the habitable zone, the region around a star that's warm enough for liquid water. Also, planets shining bright enough to appear in pictures must be glowing from the heat of formation and so are too young to host life.

 

But if a moon orbits a mature gas giant akin to Jupiter, the planet's gravitational pull might be constantly kneading and stretching the moon, keeping its interior molten. This process, called tidal heating, is known to fuel the furnace of Jupiter's moon Io, the most volcanically active body in our solar system. With tidal heat, an exomoon should shine in pictures. "In a sense, what we're saying is that there's a way to keep warm other than starlight," says Edwin Turner, also of Princeton. "This will let us directly image moons in planetary systems even when we can't see the planet."

 

To check this idea, Turner and Peters calculated how hot a moon would have to be for current telescopes to see it. They found that most of today's observatories – such as the Keck telescope in Hawaii or the space-based Hubble and Spitzer telescopes – should be able to take moon shots, but only if the moons are around a searing 700 °C.


Via Dr. Stefan Gruenwald
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Big Idea: Detect Alien Life on a Tight Budget | Extraterrestrial Life | DISCOVER Magazine

Big Idea: Detect Alien Life on a Tight Budget | Extraterrestrial Life | DISCOVER Magazine | Astronomy physics and quantum physics | Scoop.it
Billions of planets in our galaxy have the potential for life. Now astronomers are developing powerful yet affordable ways to find it. Visit Discover Magazine to read this article and other exclusive science and technology news stories.
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Consequences of General Relativity

General relativity has a number of physical consequences. Some follow directly from the theory's axioms, whereas others have become clear only in the course of the ninety years of research that followed Einstein's initial publication.
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Astronomers discover star racing around black hole at center of our galaxy

Astronomers discover star racing around black hole at center of our galaxy | Astronomy physics and quantum physics | Scoop.it
UCLA astronomers report the discovery of a remarkable star that orbits the enormous black hole at the center of our Milky Way galaxy in a blistering 11-and-a-half years — the shortest known orbit of any star near this black hole.
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ΤΟ ΒΗΜΑ - Αστρο «φάρος» για την καμπύλωση του χωροχρόνου - science - Φυσική – Διάστημα

ΤΟ ΒΗΜΑ - Αστρο «φάρος» για την καμπύλωση του χωροχρόνου - science - Φυσική – Διάστημα | Astronomy physics and quantum physics | Scoop.it
Μια ιδιαίτερα σημαντική ανακάλυψη έκαναν ερευνητές στις ΗΠΑ. Εντόπισαν ένα άστρο που κινείται σε τροχιά γύρω από τη γιγάντια μαύρη τρύπα που βρίσκεται στο κέντρο του γαλαξία μας.
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tovima.gr - Νέα ακριβέστερη μέτρηση της διαστολής του Σύμπαντος

tovima.gr - Νέα ακριβέστερη μέτρηση της διαστολής του Σύμπαντος | Astronomy physics and quantum physics | Scoop.it
Αναλύοντας καινούργια δεδομένα επιστήμονες στις ΗΠΑ έκαναν νέους υπολογισμούς για τη λεγόμενη «σταθερά Hubble» που είναι πιο γνωστή με τον όρο «κοσμική σκάλα απόστασης».
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The Helix nebula: Bigger in death than life

The Helix nebula: Bigger in death than life | Astronomy physics and quantum physics | Scoop.it
(Phys.org)—A dying star is refusing to go quietly into the night, as seen in this combined infrared and ultraviolet view from NASA's Spitzer Space Telescope and the Galaxy Evolution Explorer (GALEX), which NASA has lent to the California Institute...
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NASA - Simulations Uncover 'Flashy' Secrets of Merging Black Holes

NASA - Simulations Uncover 'Flashy' Secrets of Merging Black Holes | Astronomy physics and quantum physics | Scoop.it
Gravity waves predicted by Einstein have never been observed directly, but many scientists think that this discovery is just a few years away.
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ΤΟ ΒΗΜΑ - Είδαν τα «σαγόνια» μιας μαύρης τρύπας - science - Φυσική – Διάστημα

ΤΟ ΒΗΜΑ - Είδαν τα «σαγόνια» μιας μαύρης τρύπας - science - Φυσική – Διάστημα | Astronomy physics and quantum physics | Scoop.it
Μια πολύ ενδιαφέρουσα όσο και σημαντική ανακάλυψη έκανε ομάδα ερευνητών στις ΗΠΑ. Εντόπισαν τον λεγόμενο «ορίζοντα γεγονότων» μιας μαύρης τρύπας.
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A clock that will last forever: Proposal to build first space-time crystal

A clock that will last forever: Proposal to build first space-time crystal | Astronomy physics and quantum physics | Scoop.it
Imagine a clock that will keep perfect time forever or a device that opens new dimensions into the study of quantum phenomena such as emergence and entanglement.
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tovima.gr - Ο μοναχικός θάνατος ενός άστρου

tovima.gr - Ο μοναχικός θάνατος ενός άστρου | Astronomy physics and quantum physics | Scoop.it
Ο πιο θεαματικός ίσως θάνατος άστρου που παρατήρησε ποτέ η ανθρωπότητα θεωρείται η έκρηξη ενός σουπερνόβα που έγινε ορατή με γυμνό μάτι σε όλα σχεδόν τα μήκη και τα πλάτη της Γης την άνοιξη του 1006.
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Physicists say there may be a way to prove that we live in a computer simulation

Physicists say there may be a way to prove that we live in a computer simulation | Astronomy physics and quantum physics | Scoop.it
Back in 2003, Oxford professor Nick Bostrom suggested that we may be living in a computer simulation.
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Large water reservoirs at the dawn of stellar birth - Astronomy Magazine

Large water reservoirs at the dawn of stellar birth - Astronomy Magazine | Astronomy physics and quantum physics | Scoop.it
Astronomy.com is for anyone who wants to learn more about astronomy events, cosmology, planets, galaxies, asteroids, astrophotography, the Big Bang, black holes, comets, constellations, eclipses, exoplanets, nebulae, meteors, quasars, observing,...
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Warp drive looks more promising than ever in recent NASA studies

Warp drive looks more promising than ever in recent NASA studies | Astronomy physics and quantum physics | Scoop.it

"The first steps towards interstellar travel have been taken, but the stars are very far away. Voyager 1 is about 17 light-hours distant from Earth and is traveling with a velocity of 0.006 percent of light speed, meaning it will take about 17,000 years to travel one light-year. Fortunately, the elusive "warp drive" now appears to be evolving past difficulties with new theoretical advances and a NASA test rig under development to measure artificially generated warping of space-time."

 

This is a follow up to the news I published a few days ago and it is a much more detailed article. It is a great read if you won't to understand while, far from being a practical possibility yet, it is something theoretically possible. 


Via Szabolcs Kósa, olsen jay nelson, Guillaume Decugis, Patrice AFRIAT, Dimitris Tso
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NASA - NASA's Swift Satellite Discovers a New Black Hole in our Galaxy

NASA - NASA's Swift Satellite Discovers a New Black Hole in our Galaxy | Astronomy physics and quantum physics | Scoop.it
Swift recently detected the presence of a previously unknown stellar-mass black hole.
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ΤΟ ΒΗΜΑ - Θα φτιάξουν μαύρες τρύπες σε εργαστήριο - science - Φυσική – Διάστημα

ΤΟ ΒΗΜΑ - Θα φτιάξουν μαύρες τρύπες σε εργαστήριο - science - Φυσική – Διάστημα | Astronomy physics and quantum physics | Scoop.it
Μια πολύ ενδιαφέρουσα ερευνητική προσπάθεια ξεκινά στα περίχωρα του Εδιμβούργου. Ερευνητική ομάδα θα προσπαθήσει να αναδημιουργήσει μέσα στο εργαστήριο τις συνθήκες που επικρατούν γύρω μια μαύρη τρύπα....
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Curiosity Rover Ready to Play in Martian Sandbox | Wired Science | Wired.com

Curiosity Rover Ready to Play in Martian Sandbox | Wired Science | Wired.com | Astronomy physics and quantum physics | Scoop.it
NASA's Curiosity rover is getting ready to stick its shovel in the Martian soil and then perform a detailed analysis of the resulting sample.
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Photon reaches from beyond the grave in quantum trick - physics-math - 04 October 2012 - New Scientist

Photon reaches from beyond the grave in quantum trick - physics-math - 04 October 2012 - New Scientist | Astronomy physics and quantum physics | Scoop.it
We can only imagine Einstein's horror at an experiment in which a pair of photons that never coexisted still become entangled...
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The Race to Bring Quantum Teleportation to Your World | Wired Science | Wired.com

The Race to Bring Quantum Teleportation to Your World | Wired Science | Wired.com | Astronomy physics and quantum physics | Scoop.it
There is an international quantum teleportation space race heating up.
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Wired Science Space Photo of the Day | Wired Science | Wired.com

Wired Science Space Photo of the Day | Wired Science | Wired.com | Astronomy physics and quantum physics | Scoop.it
Every day, Wired Science selects a new awesome space photo for our collection. Check out the mind-blowing views of galaxies, planets and stars.
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Astronomers Describe Energy Bursts Like Fireworks In The Early Universe - RedOrbit

Astronomers Describe Energy Bursts Like Fireworks In The Early Universe - RedOrbit | Astronomy physics and quantum physics | Scoop.it
RedOrbitAstronomers Describe Energy Bursts Like Fireworks In The Early UniverseRedOrbitAstronomers suggest, in the Astrophysical Journal Letters, as galaxies formed in the early universe, they were accompanied by fireworks in the form of energy...

Via L_Nibaldi
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In English.Όλα όσα θέλατε να γνωρίζετε για το σωματίδιο Higgs με απλά λόγια (και σκίτσα!) | openscience

In English.Όλα όσα θέλατε να γνωρίζετε για το σωματίδιο Higgs με απλά λόγια (και σκίτσα!) | openscience | Astronomy physics and quantum physics | Scoop.it
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A Spinning Black Hole at a Galaxy's Center | Wired Science | Wired.com

A Spinning Black Hole at a Galaxy's Center | Wired Science | Wired.com | Astronomy physics and quantum physics | Scoop.it
Like all invisible things that are only partly understood, black holes evoke a sense of mystery. Astronomers know that the tremendous gravitational pull of a black hole sucks matter in.
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