Spacetime With Stuart Gary

*The best estimates yet of Earth’s composition Astronomers have determined the most accurate estimate yet of the Earth’s core, finding it makes up 32.5 per cent of the planet’s total mass. The findings are part of a new understanding of the Earth’s composition, which will help scientists develop new methods to determine if exoplanets orbiting distant stars are likely to be capable of supporting life. *New supernovae study reframes the Dark Energy debate A new study claims the accelerating expansion of the universe may not be real, but could just be an apparent effect. The study claims the fit of Type Ia supernovae to a model universe with no dark energy appears to be very slightly better than the fit for the standard dark energy model. *Curiosity climbing a Martian ridge NASA's Mars Curiosity rover has begun the steep ascent up an iron-oxide-bearing ridge that's grabbed scientists' attention since before its arrival on the red planet in 2012. The Vera Rubin Ridge stands prominently on the north western flank