At least 16 people have died of heatstroke in southern India so far this summer, officials said Sunday, as a heat wave grips swathes of the country following official health warnings.
When you look up at the sky on a sunny day, the sun might seem like a bright spot, unchanging in the sky. But the sun is a complex, dynamic celestial body, wrapped in electrical currents and magnetic fields that constantly move and tangle as it rotates. At times the sun's surface is very active, casting out powerful bursts of plasma called coronal mass ejections, while at other times it is calmer.
At the center of most large galaxies sits a supermassive black hole (SMBH). When these black holes are actively consuming material, they become incredibly luminous quasars. But some quasars appear wrapped in thick clouds of dust, making them hard to detect. In a new study, astronomers have revealed 77 new, hidden, "heavily reddened" quasars (HRQs).
