NASA scientist Tom Barclay says new discoveries by the Kepler satellite mean habitable planets are no longer just "theoretical":
T. Barclay: These discoveries suggest that there are many habitable, small planets.
T. Barclay: Discussing habitable planets is no longer a theoretical exercise.
More top news
The dad of Luke Jenkins, who died at Bristol Royal Hospital's children's cardiac unit labelled an NHS England review a 'tick-box exercise'.
Conservative heavyweights Boris Johnson and Theresa May are to launch their leadership bids on Thursday.
Michael Sandford, from Surrey, is accused of trying to grab a police officer's gun while asking Donald Trump for his autograph at a rally.