Alessandro Carrozzi, taken near Palencia, Spain The Sun’s corona glows in all its glory in this high-dynamic range image taken during totality on Aug. 12. Bright prominences are visible at the Sun’s limb, as well as faint outer structures formed by the solar wind streaming out along magnetic field lines. Earthshine is also apparent, dimlyContinue reading "The corona from Spain"
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During the total solar eclipse of Aug. 18, 1868, two astronomers, Pierre Jules César Janssen of France and J. Norman Lockyer of England, each independently discovered a new line in the Sun’s spectrum. Lockyer thought it showed an undiscovered element, which he named helium. (In Greek mythology, Helios was the Sun god.) Although scientists wouldContinue reading "Aug. 18, 1868: Helium is discovered"
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Looking for a sky event this week? Check out our full Sky This Week column. August 17: Mars at Gemini’s feet Wait until after about 10 P.M. tonight to begin your deep-sky observing and the Moon won’t be a bother. An excellent target is NGC 6939, an open cluster in Cepheus the King. This cluster is quiteContinue reading "The Sky Today on Tuesday, August 18: Stars and sparklers"
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Rocket launches this week On Tuesday, Aug. 18, Chinese aerospace firm LandSpace is targeting 7:35 p.m. EDT for the second flight of its Zhuque-3 rocket from the Jiuquan Satellite Launch Center in China, according to tracking from Next Spaceflight. The launch was scrubbed last week after a Long March 7A rocket exploded hours before Zhuque-3’sContinue reading "More Starlink satellites and two big launches for China"
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Life in space is hard. Most orbiting observatories retire well before their 20th birthday. Yet the Hubble Space Telescope has survived and continues to thrive well into its 30s. Astronomers celebrated the observatory’s 36th birthday in April by releasing a new image of the Trifid Nebula (M20). This stellar nursery lies about 5,000 light-years fromContinue reading "Hubble captures a corner of M20"
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If a satellite’s velocity increases as it approaches a planet during a slingshot maneuver, why does it not decrease by the same amount when it leaves the planet? How can it experience a net gain in velocity? Robert WaltyStephens City, Virginia Slingshot maneuvers can seem counterintuitive. We know that a spacecraft speeds up as itContinue reading "How do slingshot maneuvers work to propel spacecraft?"
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The sharpest images ever taken of the Sun’s surface reveal ribbons of solar plasma curling into tight, wave-like vortices near the edge of a sunspot — a pattern never before seen on our star. The experiment behind the discovery was designed to push the technical limits of a new camera system, not hunt for newContinue reading "World’s largest solar telescope reveals the Sun’s hidden texture"
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Astronomer Asaph Hall met Angeline Stickney at New York Central College in 1855. Two years his elder, she instructed him in geometry and German, and was reputedly so strong a mathematician that Hall and his classmate made a game of trying to stump her, yet never could. The pair were married the following year. ForContinue reading "Aug. 17, 1877: Asaph Hall discovers Phobos"
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Looking for a sky event this week? Check out our full Sky This Week column. August 16: The Moon hangs with Venus Mars has been making its way eastward through the constellation Gemini, pulling away from open cluster M35 and approaching the two bright stars Eta (η) and Mu (μ) Geminorum. Eta shines at magnitude 3.3 and MuContinue reading "The Sky Today on Monday, August 17: Mars at Gemini’s feet"
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