Surpreendente frio em Netuno Space

Surpreendente frio em Netuno

Netuno, o planeta mais externo de nosso sistema solar, não pertence aos gigantes do gelo com seu vizinho Urano por nada. A enorme distância até nossa estrela central garante que a temperatura lá fora caia abaixo de 200 graus negativos (-238°F). Exatamente o calor depende, é claro, de sua posição atual em órbita. No entanto, não são realmente de se esperar estações distintas: Netuno tem uma órbita quase circular, de modo que só se afasta ou se aproxima minimamente do Sol e, ao mesmo tempo, fica nesta órbita com uma inclinação axial muito baixa, enquanto a Terra está inclinada…
Water oceans in the crust of icy planets Life

Water oceans in the crust of icy planets

A pressure 200,000 to 400,000 times that of Earth's atmosphere, plus temperatures around 1500 Kelvin - these sound like uncomfortable conditions. They prevail where, in water-ice planets of the size of Neptune, the ice merges into the rocky core. Does liquid water exist under these conditions, and if so, how does it interact with the planet's rocky seafloor? New experiments show that on water-ice planets between the size of our Earth and up to six times that size, water selectively leaches magnesium from typical rock minerals. An international team of researchers led by Taehyun Kim of Yonsei University in Seoul,…
Where the geysers on Neptune’s moon, Triton, come from Space

Where the geysers on Neptune’s moon, Triton, come from

Triton is a strange moon. It is the only one of the large moons of our Solar System that rotates the wrong way about its planet – Neptune, the eighth and outermost planet. That’s also why it’s assumed that Triton is a Kuiper belt object, similar to Pluto, that was captured by Neptune. On first look, Triton appears very hostile to life – at temperatures close to 0 Kelvin, the atmosphere, which consists of nitrogen, methane, and carbon monoxide, is almost completely frozen, and thus it is very thin; Earth’s atmosphere is 70,000 times thicker. (mais…)