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Αlexandros_29 έγραψε:http://blogs.discovermagazine.com/badastronomy/2011/02/14/no-theres-no-proof-of-a-giant-planet-in-the-outer-solar-system/
οταν μια υπόθεση γινεται είδηση ...
kingstonian έγραψε: μια υποθεση....αφου ειναι σε θεση να ανακαλυπτουν πλανητες σε ετη φωτος μακρυα...αυτον εδω που ειναι μερος του ηλιακου μας συστηματος πως και δεν τον ειχανε βρει ποτε??
Ogygos έγραψε:Αlexandros_29 έγραψε:http://blogs.discovermagazine.com/badastronomy/2011/02/14/no-theres-no-proof-of-a-giant-planet-in-the-outer-solar-system/
οταν μια υπόθεση γινεται είδηση ...
"I read their papers, and thought the data were interesting but unconvincing. The sample size was too small. A bigger study was done, but again the effects weren’t quite enough to rise to the level of breakthrough. I’m not saying the astronomers are wrong — the data were certainly provocative, and potentially correct! Just not firm enough."
Εγώ δεν βλέπω επιστημονική επιχειμηματολογία , περισότερο επιχειμηματολογία μαγειρικής του τύπου η σάλτσα ήθελε λίγο περισότερο αλεύρι.
The new analysis confirmed that the 27-million-year cycle exists, with an excess of extinctions happening around those peaks. There are, of course, extinctions that occur in the middle of a cycle, and sometimes when a peak comes around the Earth has been safe. But on the whole, the scientists confirmed that life gets a bit more risky here on Earth every 27 million years.
(By the way, we have 16 million years until the next peak, so no need to get too worried.)
No Nemesis?
However, far from helping to confirm the Nemesis hypothesis, Melott and Bambach argue their findings suggest Nemesis couldn't possibly exist.
"If Nemesis existed and had this kind of an orbit, its orbit would not be regular," Melott told SPACE.com. "Calculations indicate its orbit would change by 20 to 50 percent due to the gravitational attraction of stars as they pass by us, and the movement of the sun in the galaxy."
Hellegennes έγραψε:Ogygos έγραψε:Αlexandros_29 έγραψε:http://blogs.discovermagazine.com/badastronomy/2011/02/14/no-theres-no-proof-of-a-giant-planet-in-the-outer-solar-system/
οταν μια υπόθεση γινεται είδηση ...
"I read their papers, and thought the data were interesting but unconvincing. The sample size was too small. A bigger study was done, but again the effects weren’t quite enough to rise to the level of breakthrough. I’m not saying the astronomers are wrong — the data were certainly provocative, and potentially correct! Just not firm enough."
Εγώ δεν βλέπω επιστημονική επιχειμηματολογία , περισότερο επιχειμηματολογία μαγειρικής του τύπου η σάλτσα ήθελε λίγο περισότερο αλεύρι.
Καλά, αν θες επιστημονική επιχειρηματολογία, πάρε αυτό:The new analysis confirmed that the 27-million-year cycle exists, with an excess of extinctions happening around those peaks. There are, of course, extinctions that occur in the middle of a cycle, and sometimes when a peak comes around the Earth has been safe. But on the whole, the scientists confirmed that life gets a bit more risky here on Earth every 27 million years.
(By the way, we have 16 million years until the next peak, so no need to get too worried.)
No Nemesis?
However, far from helping to confirm the Nemesis hypothesis, Melott and Bambach argue their findings suggest Nemesis couldn't possibly exist.
"If Nemesis existed and had this kind of an orbit, its orbit would not be regular," Melott told SPACE.com. "Calculations indicate its orbit would change by 20 to 50 percent due to the gravitational attraction of stars as they pass by us, and the movement of the sun in the galaxy."
http://www.space.com/8779-sun-rumored-hidden-companion-exist.html
Και ο λόγος που το λένε αυτό είναι ότι η ηλιόπαυση συμβαίνει εκατοντάδες φορές πιο μέσα από την τροχιά του υποτιθέμενου πλανήτη.
Ogygos έγραψε:
Επίσης θα πρέπει να λάβουμε υπ΄ όψιν μας ότι όσο μεγαλύτερο είναι το ουράνιο σώμα τόσο λιγότερο επηρεάζεται η τροχιά του από βαρητικές έλξεις.
Ogygos έγραψε: Εξάλλου με βάση την περιορισμένη ακρίβεια των μετρήσεων δεν έχει τόσο σημασία αν αλλάζει λίγο η τροχιά του.
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