The Hunt for Exomoons, Image Stacking, and Northwestern Andromeda
In the September 2020 issue of Sky & Telescope, we finish off our three-part series on volcanism with a look at the end of the life cycle of a volcanic world. We also take a look at the pros and cons of image stacking when processing your images. The Andromeda Galaxy is a popular astrophotography target, and this month, we guide readers through several of its subtle wonders. Such little marvels are nowhere near as hard to spot as the so-far elusive exomoon. Read all about the scientists who are painstakingly hunting for moons outside of our solar system. Finally, after a decade of careful observation and comparison, a team of astronomical detectives has estimated the date and time that Johannes Vermeer observed the scene he painted in View of Delft, using his carefully painted patterns of light and shadow as clues.
The Fate of Volcanic Worlds
Comparing the volcanic histories of the inner solar system worlds tells us how rocky bodies age.
By Paul Byrne
Dating Vermeer’s View of Delft
A team of astronomical detectives delves into a masterwork by a mysterious artist.
By Donald W. Olson et al.
The Pros and Cons of Image Stacking
This method is all about improving signal and reducing noise, though you need to know when to apply it.
By Sean Walker
The Hunt for the First Exomoons
A handful of scientists are attempting to discover the first moons outside our solar system.
By Shannon Hall
The Andromeda Outback
Exploring northwestern Andromeda reveals subtle but satisfying wonders.
By Ken Hewitt-White
Beyond the Printed Page:
See the painting and learn more about Johannes Vermeer.
Use our tool to spot Neptune’s largest moon.
Enjoy NASA’s 3D model of M57’s structure.
Read about more homemade eyepieces on Red Henry’s Facebook page.
ALSO IN THIS ISSUE:
Tour the Vega Hour
There’s something to see on September evenings no matter which direction you face.
By Fred Schaaf
Voyaging to Neptune
The most distant planet is at opposition this month.
By Bob King
The Moon’s Biggest Cold Spot
This popular lunar region hides an enduring mystery.
By Charles Wood
The Berkeley Clusters
These groupings are rarely observed but often rewarding.
By Sue French
Table of Contents
See what else September's issue has to offer.