Monthly Archives: January 2014

EECHOO KAI CHRONOS APARCHEES

Ακούγοντας την «ηχώ» της Μεγάλης Έκρηξης Υποθέστε ότι θέλετε να διερευνήσετε την απαρχή του χρόνου, τις πρωταρχικές στιγμές της συμπαντικής εξέλιξης, με άλλα λόγια να «ακούσετε» την ίδια την «ηχώ» της Μεγάλης Έκρηξης. Λαμβάνοντας υπόψη ότι όσο πιο μακριά βλέπουμε … Continue reading

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RADIATION SHIELDING IN SPACE EXPLORATION–(C) RADIATION SHIELDING OF COMPOSITE SPACE ENCLOSURES

(BEING CONTINUED FROM 25/05/13) Space electronic systems employ enclosures to shield sensitive components from space radiation. The purpose of shielding is to attenuate the energy and the flux of ionizing radiation as they pass through the shield material, such that … Continue reading

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TELE-SCOPE / ΤΗΛΕ-ΣΚΟΠΙΟ / ТЕЛЕ-СКОП

Έλληνας ανακάλυψε το τηλεσκόπιο και όχι ο Γαλιλαίος Σύμφωνα με τον αείμνηστο ιστορικό και συγγραφέα πολλών αστρονομικών βιβλίων, Αλέξανδρο Λαγκαδά, το τηλεσκόπιο δεν το ανακάλυψε ο Γαλιλαίος, αλλά ένας Έλληνας, που ζούσε στην Ολλανδία και λεγόταν Ζαχαρίας Ιωαννίδης-Ζανσέν!.. Ο Γαλιλαίος … Continue reading

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A METAL-RICH BLACK HOLE BINARY IN THE GALACTIC HALO

Emilios T. Harlaftis,5,6 Jonay I. Gonza´lez Herna´ndez,1,2,3 Rafael Rebolo,1,4 Garik Israelian,1 Alexei V. Filippenko,7 and Ryan Chornock7Received 2006 April 3; accepted 2006 April 26; published 2006 May 25 ABSTRACTWe present medium-resolution optical spectra of the secondary star in the high … Continue reading

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What is Astronomy? (iv)

(BEING CONTINUED FROM  21/05/13) Newton’s Laws of Motion In 1687 Netwon finally published his Principia were he laid out his laws fundamental laws of motion. The Law of Inertia: If the sum of the forces on an object add to … Continue reading

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ΕΛΛΗΝΙΚΗ ΕΝΟ-ΠΟΙΗΣΙΣ ΤΟΥ ΟΛΟΥ ΠΑΝΤΟΣ ΔΙΑ ΖΕΥ ΞΕΩΣ ΤΩΝ ΞΕΙΝΩΝ (1)

ΕΛΛΗΝΙΚΗ ΑΣΤΡΟΝΟΜΙΑ ΚΑΙ ΧΡΙΣΤΙΑΝΙΚΗ ΚΟΣΜΟΛΟΓΙΑ (συνεχιζεται)  

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SPACE DEBRIS AROUND G®AIA (A)

A)SAILING SATELLITES INTO SAFE RETIREMENT When satellites reach the end of their working lives, they may pose a threat to other spacecraft as they continue to orbit in a dormant state for many decades. But now a new way to … Continue reading

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