migrants are often transported by bus from mexico s southern border with guatemala as they head north to the us. nasa has released new images from the james webb space telescope that show the intricate details of a dying star s final stages. the glowing halo and vibrant colours are from the ring nebula one of the greatest examples of gas and dust regions formed from dying stars. you re live with bbc news. a three day summit of five major emerging economies known as brics is under way injohannesburg, south africa. the bloc s members brazil, russia, india, china, and south africa make up nearly 40% of the world s population and about a quarter of global gdp. they re looking to offer an alternative to what they see as western led global alliances though member countries differ onjust how to achieve that vision. in fact, brazil s president, luiza inacio lula da silva, insisted that it was not