Empty space is not completely empty in the equations of quantum physics. Under an ordinary magnetic field, that distinction is impossible to notice. Near a magnetar—a neutron star with a magnetic field trillions of times stronger than Earth’s—space itself can alter the way light travels. NASA’s Imaging X-ray Polarimetry Explorer (IXPE) has measured unusually strong […]

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Which naked-eye star is richest in metals and what is the estimated mass of the metal contained therein? ThomasMineral, Virginia In astronomer-speak, metals refer to elements heavier than helium. The first stars that lit up the universe were very metal-poor, since hydrogen and helium were just about the only materials around after the Big Bang. TheseContinue reading "Which naked-eye star is richest in metals?"

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Stars do not actually switch their lights on and off when they twinkle. The flicker happens between the star and your eyes, as its light passes through Earth’s moving atmosphere. Planets are affected by the same air, but they usually look steadier because their light arrives from a small disk rather than a single point. […]

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