COMET

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Cardiology Carvedilol or Metoprolol European Trial. A trial comparing carvedilol and immediate release metoprolol tartrate on clinical outcome in patients with moderate to severe heart failure
Conclusion Cardiovascular deaths occurred in 29% of carvedilol patients and in 35% of metoprolol patients
ENT Combined microscopic & endoscopic technique. An alternative to the technically demanding endoscopic sinus surgery for chronic sinus diseases, a technique which allows less experienced operators to manage these diseases with fewer complications

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Although the comet's brightness had fallen to about 4th or 5th magnitude, it's extraordinarily broad dust tail spanned an arc of no less than 110[degrees], even though its overall length didn't exceed a stubby 3[degrees] to 4[degrees].

Reflecting on PanSTARRS: rarely is such a bright comet so hard to see

The changing appearances of Comet Lovejoy's brilliant, sweeping dust tail and slender, straight gas tail are evident in this daily sequence obtained by the Heliospheric Imager on the STEREO A spacecraft between December 16th and 19th as the comet moved away from the Sun.

The remarkable case of comet lovejoy: despite the odds against it, comet lovejoy survived its swing by the sun and became one of the most spectacular comets in the past few decades

That's when the magnificent extent of its dust tail became apparent.

McNaught's passing fancy: we knew Comet McNaught was coming, but we didn't realize that it would put on such a great show

Using the 8.1-meter Gemini North telescope on Mauna Kea, Henry Hsieh and David Jewitt (University of Hawaii) found that main-belt asteroid 118401, discovered in 1999, is ejecting a comet-like dust tail. Although the tail is too faint for spectroscopic measurements, Hsieh and Jewitt infer from the dust's velocity and the long duration of activity that the material is ejected when subsurface water ice sublimates, that is, turns directly from solid to gas.

Main-belt comets

Bright moonlight obscured much of Halley's dust tail leading up to the full Moon on April 24th.

How long was Halley's tail in 1986?

The hood's eastern end blended into the comet's broad dust tail, which itself was comprised of fine or wispy striations.

Comet Machholz's fine performance: this celestial visitor delighted skywatchers as it took a leisurely cruise across the northern sky

Each of the 10 parts have comet-like dust tails, and the biggest four chunks are each double the size of a football field.

Astronomers spot rare asteroid break-up

Most meteor showers originate from comets composed of ice emitting millions of kilometres of dust tails. But Geminids are different.

Geminid Meteor Showers to Light up the Sky: When and Where to Watch

He covers dynamics, physical aspects, spectra, spectra of coma, gas production rates in coma, dust tails, light scattering theory, the nature of dust particles, ion tails, nucleus, origin, and relations to other solar system studies.

Physics of comets, 3d ed

Imaging the fainter ones can present an interesting challenge; they require much longer exposures to reveal any streaming ion or dust tails, which leads to more complex issues when assembling your image.

Comet freeze: here's a great technique for stacking your comet photos in ImagesPlus

As well as flaunting two dust tails, it sported a ghostly bluish-white stream of charged particles, extending a third of the way across the sky (SN: 6/1/96, p.