San Antonio, Texas, USA San Antonio beckons with its vibrant culture and historical significance, offering a plethora of free ...

Oilfield services giant Halliburton has announced plans to collaborate with five new companies through its Halliburton Labs, which helps companies advance commercializing their technology. One of the ...

▲ 摘要：在许多星系团的中心，炽热（大约107开尔文）星系团内介质可变得足够致密，以至于其本应在短时间内冷却。然而，在大质量中心星系中测量到的恒星形成率很低，且冷却气体中没有软X射线，这表明大多数气体从未冷却过。这就是所谓的冷却流问题。