The News and Super Earth Kepler-22b

Yesterday, NASA confirmed another new exoplanet from the Kepler mission, Kepler-22b. From some of the headlines, you’d think it was time to pack your bags. The discovery of Kepler-22b is undeniably exciting, but there’s a lot we don’t know about this planet.

Of cosmic telescopes and high-z galaxies

Lensing occurs when the mass of a foreground object distorts and magnifies the light from a background galaxy or quasar, sometimes even creating multiple images. It probably isn’t a stretch to say that the neatest thing about lensing is that you can typically see two to four images of the same galaxy. But something else that’s cool is that these distant background objects are magnified, making it possible to study them in detail when otherwise they might not be seen at all: in this way, gravitational lenses act as natural cosmic telescopes.

Simulating the Milky Way’s stellar halo

Simulating the Milky Way’s stellar halo

The Milky Way’s stellar halo – a roughly spherical distribution of stars surrounding our spiral galaxy – is a valuable tool for probing the early evolution of our galaxy. The stellar halo contains some of the oldest stars in our galaxy, whose properties reflect that of the environment in which they formed. This paper focuses on using cosmological simulations of galaxy formation to match the observed structure and kinematics (how the stars move) of stars in Milky Way’s halo.