Astronomy

This map unfolds the entire night sky from sunset (at right) until sunrise (at left). Arrows and colored dots show motions and l ...

1° E PERSEUS AURIGA Capella Path of Comet PANSTARRS May 1 26 21 16 11 6 April 1 c ¡ d 58 N Comet PANSTARRS (C/2016 R2) 15" Ganym ...

1° Path of Ceres May 1 26 21 16 6 April 1 11 CANCER o m^3 m^2 m^1 m^4 61 (^5746) 70 67 l^2 l^1 ι N E Sneaking past the Crab’s ...

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WWW.ASTRONOMY.COM 45 Anyone who could reason and keep records would notice that the rate of lightning has increased a lot. The l ...

Local “Orion” Arm Milky Way Sun Iron nucleus 26 protons 34 neutrons Cobalt nucleus 27 protons 33 neutrons Co-60 Neutron changes ...

Supernova Radiation breaks nitrogen molecule apart Supernova emits radiation Nitrogen atoms combine with oxygen Nitrous oxide co ...

48 ASTRONOMY • APRIL 2018 the nuclei of heavier elements. Their ener- gies are customarily measured in electron volts (eV), the ...

Visible Increasing energy Increasing wavelength 0.001 nm 10 nm 0.0001 m 1 m (100,000 nm) Visible light 400 nm 500 nm 600 nm 700 ...

50 ASTRONOMY • APRIL 2018 NIGHTSCAPE PHOTOGRAPHY Secrets of ...

WWW.ASTRONOMY.COM 51 Get started on this wonderfully challenging marriage of artistic vision, nocturnal exploration, and technic ...

52 ASTRONOMY • APRIL 2018 Perspective means considering how you want a viewer to perceive your photograph. Should it be from you ...

WWW.ASTRONOMY.COM 53 of the bottom center of the scene, taking your eye straight to the tree in the distance. Even though it dis ...

54 ASTRONOMY • APRIL 2018 a remote trigger or intervalometer to open your camera’s shutter so you don’t have to touch the camera ...

WWW.ASTRONOMY.COM 55 Before getting down to brass tacks on the settings for a single exposure, there’s one critical thing to add ...

56 ASTRONOMY • APRIL 2018 Rick Hedrick (left) and Joe Haberman, PlaneWave’s founders, stand beside a fully assembled 1-meter tel ...

This innovative company isn’t just about optics — the key is its people. text and images by Tony Hallas PlaneWave laneWave Instr ...

58 ASTRONOMY • APRIL 2018 when you order a PlaneWave CDK. Hedrick has brought on board many extremely skilled associates, and th ...

Galaxies in and around Virgo offer a telescopic delight for deep-sky fans. by Phil Harrington Spring’s galaxies best & brigh ...

60 ASTRONOMY • APRIL 2018 Choosing the Whirlpool Galaxy, M51, was easy. It’s my favorite galaxy. Not only is it bright enough to ...