Have we really found Earth 2.0?

Have we really found Earth 2.0?

Last month Nasa announced, in what seems like a roughly annual event, the discovery of “Earth 2.0″. Described as a “Bigger, Older Cousin to Earth”, Kepler 452b is the first small planet (defined here as less than twice the radius of the Earth) to be in a roughly one year orbit around a Sun-like star.

But is it otherwise that similar to the Earth? Is it potentially habitable? To try and answer that, let’s look at the discovery paper.

55 Cancri e: Now With Added Volcanoes

55 Cancri e: Now With Added Volcanoes

Of the more than 1500 exoplanets discovered over the past two decades, perhaps the most intriguing and unexpected have been the ultra-short period planets, worlds so close to their parent star that they complete an entire orbit in less than a day. Most are small, less than twice the radius of the Earth, and are so hot that their rocky crusts are being melted away. The debris could be used to investigate the composition of these mysterious worlds, but most of them are too small for our current instruments to observe in detail.

Titan’s Cameo as an Exoplanet

Titan’s Cameo as an Exoplanet

This paper uses Cassini’s infrared eyes to watch the Sun appear to pass behind Titan and light up its atmosphere. From these observations, the authors model different components of the thick atmosphere, and gain new insights about how exoplanets with similar hazy atmospheres might look.