Tag: 爱上海ZD

Barça monitors Isak

first_imgAs reported by SER Catalunya in its Què t’hi Jugues program, Alexander Isak (09-21-1999), one of the sensations of the season, is on Barça’s agenda as plan B if the Barça club fails to close the signing of Lautaro Martínez, which is the Barça club’s number one goal for this summer.Isak, one of the sensations of the season but a player still to be exploited and to achieve regularity in the game, has scored 14 goals in 34 official matches this year and has been the hero of Real in the Cup, where he has scored seven goals in seven games. With spectacular conditions to play soccer despite 1.90 meters, it has impressed by its way of handling both legs, of falling to the bands, of turning. His coordination speaks of a great player and, of course, that has put him on the agenda of the best European teams. The Swedish international (11 games, four goals with his team) has a clause of 70 million euros this summer. The amount will remain for other summers, but with an asterisk. Borussia Dortmund could play it back for 30 million euros. Of course, only in the summers of 2021, 2022 and 2023. The price of Isak for all clubs, including Dortmund, is 70 million euros as reported by Mundo Deportivo last February.last_img read more

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Astronomers spot planetforming gas and dust 600 million years after the big

first_img The big bang only provided the universe with a few basic building blocks: mostly hydrogen, some helium, and traces of other light elements. Everything else needed to make planets and life is created by stars burning, which fuses hydrogen into heavier elements. (Some of the very heaviest elements are thought to require the energy of a supernova to forge them.) A team of astronomers used the Atacama Large Millimeter/submillimeter Array (ALMA), a collection of 66 radio dishes high in the mountains of northern Chile, to discover a very distant galaxy called A2744_YD4 (pictured in an artist’s impression, above) in the very early days of the universe—when it was just 4% of its current age. They were surprised to find it was already full of dust—microscopic grains of most probably silicon, carbon, and aluminum. The team reports in a paper published today in Astrophysical Journal Letters that they were viewing A2744_YD4 about 600 million years after the big bang, only 200 million years after the current best estimate of when the universe’s very first stars lit up. Even though they estimate that the galaxy was forming stars at a rate of 20 solar masses per year (compared with 1 solar mass in today’s Milky Way), to have produced all that dust in just 200 million years, the galaxy’s first stars must have burned hard and fast. That’s valuable information because astronomers are intensely interested in this first generation of stars, in an era often called cosmic dawn. At that time, almost all the neutral gas pervading the whole universe underwent a profound change: It had electrons stripped away to transform it into the ionized gas we see today. What caused the ionization is not known for certain but astronomers suspect light from the first stars is the culprit. Studies such as this one from ALMA will help astronomers answer the question of whether there were enough stars, shining brightly enough at the right wavelength, to bring about this transformation. By Daniel CleryMar. 8, 2017 , 6:00 AM Astronomers spot planet-forming gas and dust 600 million years after the big banglast_img read more

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