Cosmic Pursuits

Basic astronomy and night sky information

Science of Astronomy

Articles about the science of astronomy and objects that are visible in the night sky.

Farewell to Jupiter, and Hello

by Brian Ventrudo Filed Under: Science

Artist's concept of Juno at Jupiter (credit: NASA)
Artist’s concept of Juno at Jupiter (credit: NASA)

If you’ve been following the news this week, you know that Jupiter has a new moon, a man-made moon called Juno. The NASA spacecraft, bejeweled with solar cells and as big as a basketball court, entered an elongated orbit around the big planet on July 4 as it began a 20-month study of the structure of Jupiter. While Jupiter may be fading in the western sky after sunset, still visible but soon to be lost to our telescopes, it will continue to reveal many secrets to Juno during the coming months [Read more…] about Farewell to Jupiter, and Hello

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The Dusty Birth of a New Star

by Brian Ventrudo Filed Under: Science

A newly formed star lights up the surrounding cosmic clouds in this image from ESO’s La Silla Observatory in Chile. Dust particles in the vast clouds that surround the star HD 97300 diffuse its light, like a car headlight in enveloping fog, and create the reflection nebula IC 2631. Although HD 97300 is in the spotlight for now, the very dust that makes it so hard to miss heralds the birth of additional, potentially scene-stealing, future stars. Credit: ESO.
A newly formed star lights up the surrounding cosmic clouds in this image from ESO’s La Silla Observatory in Chile. Dust particles in the vast clouds that surround the star HD 97300 diffuse its light, like a car headlight in enveloping fog, and create the reflection nebula IC 2631. Although HD 97300 is in the spotlight for now, the very dust that makes it so hard to miss heralds the birth of additional, potentially scene-stealing, future stars. Credit: ESO.

This marvelous image from the European Southern Observatory shows a small section of the Milky Way going about its business making new stars. Here you see in this dusty region the reflected light of a new main sequence star, HD 97300, as it settles down into its billion-year life span [Read more…] about The Dusty Birth of a New Star

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A Ninth Planet Discovered?

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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The Science of the Christmas Star

by Brian Ventrudo Filed Under: Science

L_Adoration_des_Mages“O star of wonder, star of night,
Star with royal beauty bright,
Westward leading, still proceeding,
Guide us to thy perfect light.”

It may be the most famous star in history. But was it real? Mentioned just once in the gospel of Matthew, the “Star of Bethlehem”, or the “Christmas Star”, may have guided three wise men from the East in search of a newborn king. A few words written on a scroll two thousand years ago isn’t much to go on, but astronomers have a few ideas that may explain the apparition of a star near the time of the birth of Jesus.
[Read more…] about The Science of the Christmas Star

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Fly Along With a Comet

by Brian Ventrudo Filed Under: Science

rosetta_rotate_wac_20140910
Animation of the nucleus of Comet 67/P Churyumov–Gerasimenko. (Courtesy ESA / Rosetta / MPS for OSIRIS Team MPS / UPD / LAM / IAA / SSO / INTA / UPM / DASP / IDA / “Herobrine”

Here’s a little Christmas present from the imaging team in charge of the OSIRIS camera on the Rosetta spacecraft, the little European probe that has been orbiting comet 67P/Churyumov–Gerasimenko. Though they were criticized for keeping the images to themselves for many months, the team has finally released a treasure chest of images online for the first time since Rosetta encountered the comet in August 2014. More images of the comet will be released into the albums in time. You can explore the images and albums of the Rosetta encounter with Comet 67/P at the link above [Read more…] about Fly Along With a Comet

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