Radiante

Ainda a definição de planeta

A Rebecca Harbison de Cornell diz o seguinte sobre a questão da definição de planeta:

Only for our own Solar System, since we can’t really see the shapes of exoplanets (planets outside our Solar System), nor can we tell if they have cleared their orbits, since seeing smaller stuff is often difficult. On the other hand, since all of the exoplanets (with three exceptions — the planets observed around a pulsar) are as big as our gas giants, they probably have cleared out their orbits, and it would be difficult to imagine them not being round.

Três anos em Marte

A ver dois filmes sobre os rovers. Um aqui e outro aqui. Os dois lá continuam a esquadrinhar pedras em busca de um passado distante. Agora que o Sol da Primavera vai despontando.