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A group of cave explorers and scientists have made a rare discovery: an entirely new taxonomic family of spider in the caves of southern Oregon. Only two other spider families (the taxonomic group above both genus and species) have been found since 1990, and this is the first newly discovered, native one uncovered in North America since 1890, said California Academy of Sciences researcher Charles Griswold, lead author of the study that described the species.

Curiosity phoned home throughout its daring and unprecedented landing sequence that night, giving its nervous handlers step-by-step status and health updates. The European Space Agency's Mars Express orbiter recorded some of this chatter, and now we can hear what Curiosity had to say.

Scientists have located a galaxy that gives births to more stars in a day than ours does in a year. Astronomers used NASA's Chandra X-Ray telescope to spot this distant gigantic galaxy creating about 740 new stars a year. By comparison, our Milky Way galaxy spawns just about one new star each year.

This week's arrival of NASA's Mars rover Curiosity set the stage for a potentially game-changing quest to learn whether the planet most like Earth ever had a shot at developing life, but follow-up missions exist only on drawing boards.

The first pictures from the best cameras on NASA's Curiosity rover document a Martian landscape so Earthlike it reminds scientists of home. "The first impression that you get is how Earthlike this seems, looking at that landscape," said Caltech's John Grotzinger, chief scientist for the $2.5 billion mission. "You would really be forgiven for thinking that NASA was trying to pull a fast one on you, and we actually put a rover out in the Mojave Desert and took a picture."

Fossil by fossil, scientists over the last 40 years have suspected that their models for the more immediate human family tree — the single trunk, straight as a Ponderosa pine, up from Homo habilis to Homo erectus to Homo sapiens — were oversimplified. The day for that serious revision may be at hand.

NASA's Curiosity rover has beamed back its first color photo from the ancient crater where it landed on Mars and a video showing the last 2 1/2 minutes of its white-knuckle dive through the Martian atmosphere, a sneak peek of a spacecraft landing on another world.

Nasa has provided almost 300 thumbnails from a sequence of pictures that will eventually be run together as a colour hi-def movie. Visible in the timelapse is the heatshield discarded by the vehicle as it neared the ground. So too is the dust kicked up by the rover's rocket-powered crane. It was the crane that finally settled the robot on to the surface.