kottke.org posts about jupiter

Jupiter's Great Red Spot is shrinkingMay 15 2014

Jupiter Spot Shrinking

Jupiter's Great Red Spot is becoming more of a Medium Red Spot. The gas giant's signature beauty mark was recently measured by the Hubble as spanning 10,250 miles across its widest point, down from a high of 25,500 miles across.

Historic observations as far back as the late 1800s [2] gauged this turbulent spot to span about 41 000 kilometres at its widest point -- wide enough to fit three Earths comfortably side by side. In 1979 and 1980 the NASA Voyager fly-bys measured the spot at a shrunken 23 335 kilometres across. Now, Hubble has spied this feature to be smaller than ever before.

"Recent Hubble Space Telescope observations confirm that the spot is now just under 16 500 kilometres across, the smallest diameter we've ever measured," said Amy Simon of NASA's Goddard Space Flight Center in Maryland, USA.

Amateur observations starting in 2012 revealed a noticeable increase in the spot's shrinkage rate. The spot's "waistline" is getting smaller by just under 1000 kilometres per year. The cause of this shrinkage is not yet known.

The truth of science with your own eyesMay 14 2014

Clive Thompson recently saw the moons of Jupiter with his own eyes and has a moment.

I saw one huge, bright dot, with three other tiny pinpoints of light nearby, all lined up in a row (just like the image at the top of this story). Holy moses, I realized; that's no star. That's Jupiter! And those are the moons of Jupiter!

I'm a science journalist and a space buff, and I grew up oohing and aahing over the pictures of Jupiter sent back by various NASA space probes. But I'd never owned a telescope, and never done much stargazing other than looking up in the night unaided. In my 45 years I'd never directly observed Jupiter and its moons myself.

So I freaked out. In a good way! It was a curiously intense existential moment.

For my birthday when I was seven or eight, my dad bought me a telescope. (It was a Jason telescope; didn't everyone have a telescope named after them?) We lived in the country in the middle of nowhere where it was nice and dark, so over the next few years, we looked at all sorts of celestial objects through that telescope. Craters on the Moon, the moons of Jupiter, Mars, and even sunspots on the Sun with the aid of some filters. But the thing that really got me, that provided me with my own version of Thompson's "curiously intense existential moment", was seeing the rings of Saturn through a telescope.

We had heard from PBS's Jack Horkheimer, the Star Hustler, that Saturn and its rings would be visible and he showed pictures of what it would look like, something like this:

Saturn through a telescope

But seeing that with your own eyes through a telescope was a different thing entirely. Those tiny blurry rings, visible from millions of miles away. What a thrill! It's one of my favorite memories.

Would a lava lamp work on Jupiter?Apr 09 2010

In order to see if a lava lamp would still function on Jupiter, Neil Fraser built a large centrifuge to try it out. This is the best homemade centrifuge video you'll see today:

He used the accelerometer on an Android phone to measure the G force.

The centrifuge is a genuinely terrifying device. The lights dim when it is switched on. A strong wind is produced as the centrifuge induces a cyclone in the room. The smell of boiling insulation emanates from the overloaded 25 amp cables. If not perfectly adjusted and lubricated, it will shred the teeth off solid brass gears in under a second. Runs were conducted from the relative safety of the next room while peeking through a crack in the door.

Jupiter is growing another big red spot.Mar 07 2006

Jupiter is growing another big red spot. The gas giant has been told by solar system pals to "keep an eye on it" and "have it checked out" if it gets any bigger.

We're still finding lots of new moonsMay 04 2005

We're still finding lots of new moons around the planets in our solar systems. Twelve new ones were just discovered around Saturn and Jupiter now has 63.

Tags related to jupiter:
space astronomy science physics Jupiter

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