Inside the April 2020 Issue

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Hubble’s 30th Anniversary, Telescopes Made of Mercury, and an Optical Shootout.

In April’s issue of Sky & Telescope, we take you behind the scenes for the 30th anniversary of the Hubble Space Telescope’s launch. Amateur astronomers Vanessa Thomas and Kevin Hartnett offer insight into what it’s like working with NASA and one of its Great Observatories. Then, from space telescopes to liquid telescopes, we cover the creation of the International Liquid Mirror Telescope, a telescope made with a mirror of spinning mercury. And speaking of telescopes, who could forget John Dobson, the man who brought telescope making to the masses? We’re remembering him this month with a feature on the refurbishment of an unfinished Dobsonian that was made in one of his telescope making classes. Then we dive into the roots of telescope-making with a pair of old-fashioned refractors in a dispute between two astronomers competing to be the best optician in 17th-century Europe. They may not have been able to see it back in 1663, but you can see M87’s jet, if you can go deep enough. A 12-inch telescope will do, but contributing editor Howard Banich recommends the 90-inch Bok telescope on Kitt Peak for the best view of the jet sprouting from the first black hole to ever be imaged by humans.

SEMrush

Feature Articles

Picture of Hubble Space Telescope

This picture of the Hubble Space Telescope was taken by an astronaut just after space shuttle Atlantis captured the telescope with its robotic arm on May 13, 2009, to begin a mission to upgrade and repair the telescope.
NASA, ESA

The Universe Through Hubble’s Eye
Amateurs celebrate the venerable space telescope’s 30th anniversary with a look at some of its most mesmerizing images.
By Vanessa Thomas

Quicksilver Astronomy
Forget lenses and silvering – astronomers are turning to whirling dishes of mercury to study the universe.
By Govert Schilling

A Curious Straight Ray
Gaia spacecraft data are unveiling the Milky Way’s tumultuous past.
By Howard Banich

The Classic Dobsonian Telescope
A relic of the ’70s finally sees the light.
By Jerry Oltion

Paragoni!
Two of Europe’s greatest 17th-century opticians battle for fame and fortune.
By Gabriella Bernardi

Beyond the Printed Page

PSP Orbit

The position of the Parker Solar Probe during perihelion three.
NASA/JHU/APL.

The Parker Solar Probe Reports In
Click here to view an animation of the Parker Solar Probe passing through switchbacks of the sun’s magnetic field.

Reserve a 100-inch Telescope
Follow this link to reserve one of the largest publicly available telescopes in the US.

Telescope Building with John Dobson
Learn how to build a Dobsonian from the man himself.

Betelgeuse? Where did You Go?
Read about what is really happening to Betelgeuse as it fades to an all-time low.

ALSO IN THIS ISSUE

Comet Bennett

Comet Bennett. 
Dennis di Cicco

The Great Comet of 1970
Fifty years ago, this month a feathery visitor adorned the spring sky.
By Fred Schaaf

Venus Skirts the Pleiades
The Seven Sisters welcome a brilliant visitor.
By Bob King

Filling Holes
Understanding lunar erosion helps scientists measure the depths of impact basins.
By Charles Wood

Sextans Uraniae
This obscure constellation is swarming with galaxies.
By Sue French

Table of Contents
See what else April’s issue has to offer.





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