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Η κοσμολογική σταθερά Λ του Αϊνστάιν

Η κοσμολογική σταθερά Λ του Αϊνστάιν | science4u | Scoop.it

Το μεγαλύτερο λάθος του Αϊνστάιν, όπως ο ίδιος παραδέχθηκε σε μια συνομιλία που είχε με τον George Gamow, ήταν η εισαγωγή κατά το 1917 μιας κοσμολογικής σταθεράς Λ στις εξισώσεις της γενικής σχετικότητας. Ο λόγος που το έκανε ήταν γιατί την εποχή εκείνη οι φυσικοί πίστευαν ότι το σύμπαν ήταν στατικό, ενώ οι εξισώσεις οδηγούσαν τον Αϊνστάιν σε ένα μεταβαλλόμενο σύμπαν.

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New clock would stay accurate for billions of years

New clock would stay accurate for billions of years | science4u | Scoop.it
A proposed new time-keeping system could make atomic clocks look positively erratic, staying accurate to one twentieth of a second over 14 billion years - the age of the universe.

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Huge Asteroid Impact Linked to Moon's Magnetic Hotspots

Huge Asteroid Impact Linked to Moon's Magnetic Hotspots | science4u | Scoop.it

A giant asteroid collision with the moon that created the solar system's largest known impact crater may have spawned the surprisingly strong magnetic anomalies seen on the moon, a new study suggests.

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7 Strange Ways the Japan Quake Shook the World

7 Strange Ways the Japan Quake Shook the World | science4u | Scoop.it

One year ago on March 11, the intense shaking and massive tsunami set off by a 9.0 magnitude earthquake off the coast of Japan wrought noticeable effects on our planet.

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Dark matter blob confounds experts

Dark matter blob confounds experts | science4u | Scoop.it
Astronomers using the Hubble Space Telescope are mystified by a merging galaxy cluster known as Abell 520 in which concentrations of visible matter and dark matter have apparently come unglued.
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Moon's magnetic rock may have come from asteroid

Moon's magnetic rock may have come from asteroid | science4u | Scoop.it
The moon's somewhat bizarre magnetic field may have been shaped by a massive asteroid impact, which left some of its material behind.
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Citizen Scientists Discover Cosmic Bubbles in Milky Way Galaxy

Citizen Scientists Discover Cosmic Bubbles in Milky Way Galaxy | science4u | Scoop.it

More than 5,000 space bubbles have been discovered in the disk of our Milky Way galaxy by a team of part-time citizen scientists.

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How Safe Are US Nuclear Reactors? Lessons from Fukushima

How Safe Are US Nuclear Reactors? Lessons from Fukushima | science4u | Scoop.it
The U.S. has reactors of the same designs that melted down at Fukushima Daiichi, but regulators hope changes could prevent a repeat of Japan's nuclear crisis.
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