solar system

An Observer’s Guide to the Planet Jupiter

February 18, 2016 by Brian Ventrudo Filed Under: Solar System

The planet Jupiter is always one of the brightest objects in the night sky. It’s brighter than any star, and is only outshone by the planet Venus and the Moon, and, very rarely, by Mars and Mercury. Jupiter reaches a position for optimum viewing in a telescope once every 13 months, roughly, and as you are about to discover, the visible face of Jupiter reveals so many interesting features in a small telescope that the planet is a favorite target for new and experienced stargazers [Read more…] about An Observer’s Guide to the Planet Jupiter

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Animated Flyover of Dwarf Planet Ceres

February 4, 2016 by Brian Ventrudo Filed Under: Solar System

NASA’s Jet Propulsion Lab has released this simulated but rather stirring flyover of the dwarf planet Ceres, the largest denizen of the asteroid belt between Mars and Jupiter. Using hundreds of images from NASA’s Dawn spacecraft, a team at Germany’s national space center (DLR) created a video that gives you a close-up of the most striking features of this little world.

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A Ninth Planet Discovered?

January 21, 2016 by Brian Ventrudo Filed Under: Science, Solar System

Artist's conception of the hypothetical "Planet 9" in the distant regions of the solar system. Credit: Caltech/R. Hurt (IPAC) — Artist’s conception of the hypothetical “Planet 9” in the distant regions of the solar system. Credit: Caltech/R. Hurt (IPAC)

It’s been 170 years since the eighth (and so far last) major planet, Neptune, was discovered in our solar system. Pluto, of course, was discovered in 1930, heralded as the ninth planet, but then demoted by consensus of the astronomical community, largely at the behest of the Caltech astronomer Mike Brown who reasoned that Pluto was not large enough to gravitationally clear its path of other bodies, one of the three criteria for a major planet. In the ten years since Pluto’s demotion, Brown has been asked if there are any other planets in our solar system. His answer: “Nope, that’s it.” [Read more…] about A Ninth Planet Discovered?

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Five Bright Planets Visible in the Morning Sky

January 21, 2016 by Brian Ventrudo Filed Under: Solar System

The five bright planets of the solar system are visible in the pre-dawn sky from late January to early Febuary 2016. — The five bright planets of the solar system are visible in the pre-dawn sky from late January to early February 2016 in a diagonal line rising from the southeastern horizon towards the southwest.

There’s a ‘planet fest’ in the eastern sky before sunrise in late January and early February 2016 as the five brightest planets– Mercury, Venus, Saturn, Mars, and Jupiter– make an appearance in a long incline from the eastern horizon, well past the meridian, and on towards the southwest. If you’re up early in the next two weeks, 45-60 minutes before sunrise, this is an opportune time to look to the slowly brightening sky to see this alluring array of bright planets [Read more…] about Five Bright Planets Visible in the Morning Sky

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Venus and Saturn Meet in the Morning Sky

January 7, 2016 by Brian Ventrudo Filed Under: Solar System

Venus and Saturn move within 1/2 of a degree of each other on the morning of January 9, 2016. — Venus and Saturn move within 1/2 of a degree of each other in the southeastern predawn sky on the morning of January 9, 2016.

Look to the southeastern sky before dawn on January 9 to see Venus and Saturn make a close approach to each other before sunrise. Venus is the brighter of the two, about 60x brighter than Saturn. The two planets make their closest approach at about 4h Universal Time when they are just 1/10 of a degree apart. This timing favors observers in Europe and Africa. As dawn arrives in the Americas and Australia and New Zealand, the planets will be slightly farther apart but still quite striking. Binoculars will give a good view of the two planets, and a telescope at low-to-medium power will give an excellent view of the face of Venus, which is about 77% illuminated, and the rings and brightest moons of Saturn. [Read more…] about Venus and Saturn Meet in the Morning Sky

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