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By Jove: It’s a great week to look up into the night sky

by Bob Berman
April 20, 2017
in Columns, Nature
0
By Jove: It’s a great week to look up into the night sky

n 1610, Galileo saw four stars lined up alongside the dazzling Jupiter and realized they were orbiting around that world. (Adolfo Monti)

In 1610, Galileo saw four stars lined up alongside the dazzling Jupiter and realized they were orbiting around that world. (Adolfo Monti)

This week, the Moon rises an hour later each night, leaving the first part of each night black and ideal for stargazing. The first thing you see is the very brightest “star” in all the heavens: the planet Jupiter. It came to opposition earlier this month, so it’s at its very brightest of the entire year.

Let’s be honest: You don’t want to fiddle with charts, and you’d like your astronomy fun and easy. Well, here it is. Just find the brightest star anytime between nightfall and midnight.

If you have a small telescope, point it there. It was Jupiter, shining brilliantly in Taurus the Bull, that proved the most amazing and controversial target on January 7, 1610, when Galileo Galilei saw three stars lined up alongside the dazzling planet. By the 13th he had watched them change position each night, spotted a fourth as well, and realized they were orbiting around that world.

This, 407 years ago, was no small event. At the time, Church doctrine followed the writings of Aristotle and Ptolemy and insisted that Earth is the center of all motion. For some bizarre reason, they’d made it into a religious principle. So Galileo enjoyed no benefits after he published his startling discovery that proved that Earth is not the center of all motion. Instead, those little moons whirling around Jupiter caused Galileo to be brought up on charges, forced him to recant at penalty of being burned at the stake and left him to die penniless.

But fast-forward to our modern times, and now those four giant moons visible through the smallest cheap telescope are called “the Galilean satellites.” So it all worked out for the bearded, cantankerous Italian polymath – or at least for his disembodied spirit.

There’s a bonus! Directly below Jupiter floats a distinctly blue star. In fact, it’s the bluest bright star in our sky. This is Virgo’s “Alpha” star, Spica (say “SPY-ka”). Located a whopping 260 light-years away, it’s the 14th-brightest star in our sky. Together with orange Arcturus, far to Jupiter’s left, it’s a traditional sign of spring.

And just as spring colors are returning to nature on the ground around us, it’s fun to compare Jupiter’s yellow/whiteness with the pumpkin hue of Arcturus and the sapphire-blueness of Spica.

Join the family! Grab a free month of HV1 from the folks who have brought you substantive local news since 1972. We made it 50 years thanks to support from readers like you. Help us keep real journalism alive.
- Geddy Sveikauskas, Publisher

Bob Berman

Bob Berman, Ulster Publishing’s Night Sky columnist since 1974, is the world’s most widely read astronomer. Since the mid-1990s, his celebrated "Strange Universe" feature has appeared monthly in Astronomy magazine, the largest circulation periodical on the subject. Berman is also the long-time astronomy editor of the Old Farmer’s Almanac. He was Discover magazine’s monthly columnist from 1989-2006. He has authored more than a thousand published mass-market articles and been a guest on such TV shows as Today and Late Night with David Letterman. Berman is director of two Ulster County observatories and the Storm King Observatory at Cornwall. He was adjunct professor of astronomy and physics at Marymount college from 1995-2000.

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