NASA’s Cassini spacecraft has now successfully completed its 12th ring crossing at Saturn, and is now well past the halfway point of the Grand Finale phase of its mission. Each ring crossing, with now only 10 left, brings Cassini closer to its inevitable end in September, when the spacecraft will plunge into Saturn’s turbulent atmosphere to meet its fiery fate.
NASA’s Cassini spacecraft has just successfully completed its tenth ring crossing at Saturn, on June 23, which brings it almost halfway through the Grand Finale – the last phase of the mission, which will end on Sept. 15, 2017. This leaves twelve more ring crosses to go before the end of the mission. There may not be a lot of time left for Cassini, but these last close flybys of Saturn are providing views and data never before possible – a crowning achievement for a mission which has already completely changed our understanding of the giant ringed planet and its moons.
With the Pluto flyby now well behind them, the New Horizons team has been busy preparing for the next encounter, the small Kuiper Belt Object (KBO) called 2014 MU69. New Horizons is scheduled to fly past 2014 MU69 on Jan. 1, 2019, and it will be the farthest Solar System body to ever be visited so far. From June 2-3, astronomers in Argentina and South Africa pointed their telescopes at 2014 MU69, hoping to catch its “shadow” moving across a background star as it transited the star (also known as a stellar occultation). This would help determine the object’s exact size and allow the mission team to fine-tune the planned flyby. Back at Pluto, there is more evidence, from data gathered by New Horizons during the flyby, for clouds in Pluto’s thin atmosphere.
As Cassini’s “Grand Finale” journey continues, the spacecraft has completed its eighth dive past the innermost rings of Saturn (known as a ring crossing), and there are now just under 100 days left until it plunges into the giant planet’s atmosphere, never to come back. Although time may be running out, Cassini continues to devour every drop of science data that it can, which builds upon other data that has transformed our view of the Saturnian system – a complex array of worlds like a miniature Solar System. This includes, of course, more fantastic images of Saturn and its rings and moons. The detail seen in the rings is nothing short of staggering.
The search for evidence of extraterrestrial intelligence is one of the most exciting pursuits in astronomy today. Needless to say, there is a lot of controversy and debate surrounding the topic, partly due to an event which happened in 1977 – the famous “Wow!” signal. The brief but unusual radio transmission was detected only once, and the debate over its origin has continued to this day. Now, a group of astronomers are claiming to have finally solved the mystery. According to their new study just published, the signal came not from aliens, but comets.