lowenz
23-02-2006, 10:54
Riusciranno i nostri eroi (gli esseri umani.....o i più pazzi fra loro, tipicamente gli astronomi :D) a decidere se Plutone sia o meno il vero ultimo (o anche solo nono) pianeta del sistema solare? :D
Non bastava la vecchia questione di un possibile "swapping" avvenuto in tempi remoti con Tritone (satellite di Nettuno).....ora ci si mette anche la principessa guerriera.....Xena :D
http://www.universetoday.com/am/publish/pluto_planet_not.html
Ne cito un piccolo pezzo, ma leggete pure tutto:
"As powerful observatories and space-based telescopes push out our understanding of the Kuiper Belt, many new objects have been discovered; several are close in size to Pluto. For every scientific measurement you can give Pluto: size, mass, moons, orbit, it ends up being a large Kuiper Belt Object. The brave members of the Bad Astronomy/Universe Today forum are giving this challenge their best attempt to define a planet.
And this controversy has been expanded with the discovery of 2003UB313 by the team of Michael Brown, Chad Trujillo, and David Rabinowitz. Also part of the Kuiper Belt, this object - code named Xena for now - is about 3000 km across. That makes it 700 km (430 miles) larger than Pluto! Its 557-year orbit is highly eccentric, varying between 38 and 98 astronomical units (the distance of the Earth to the Sun). Pluto, on the other hand, has an orbit that varies between 29 and 49 AU, and Neptune is 30 AU."
Non bastava la vecchia questione di un possibile "swapping" avvenuto in tempi remoti con Tritone (satellite di Nettuno).....ora ci si mette anche la principessa guerriera.....Xena :D
http://www.universetoday.com/am/publish/pluto_planet_not.html
Ne cito un piccolo pezzo, ma leggete pure tutto:
"As powerful observatories and space-based telescopes push out our understanding of the Kuiper Belt, many new objects have been discovered; several are close in size to Pluto. For every scientific measurement you can give Pluto: size, mass, moons, orbit, it ends up being a large Kuiper Belt Object. The brave members of the Bad Astronomy/Universe Today forum are giving this challenge their best attempt to define a planet.
And this controversy has been expanded with the discovery of 2003UB313 by the team of Michael Brown, Chad Trujillo, and David Rabinowitz. Also part of the Kuiper Belt, this object - code named Xena for now - is about 3000 km across. That makes it 700 km (430 miles) larger than Pluto! Its 557-year orbit is highly eccentric, varying between 38 and 98 astronomical units (the distance of the Earth to the Sun). Pluto, on the other hand, has an orbit that varies between 29 and 49 AU, and Neptune is 30 AU."