ars technica: When it comes to light, certain types of fabricated materials behave in a radically different manner from ordinary materials like water and glass: they have negative refractive indices, so that light will travel in the opposite direction expected in normal materials. These negatively refracting materials can focus light effectively, even when the wavelength of the light is much larger than the device, allowing microscopic control of optical devices.
The supermassive black hole is 40 million times as massive as the sun and powers a quasar that existed 700 million years after the Big Bang.
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Engineers expect to lose contact with the private US moon lander Odysseus on Tuesday, cutting short the mission after its sideways touchdown last week.
