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What is this “Cislunar” space?

January 24, 2023
MThomas

Though definitions sometimes differ, cislunar space generally refers to the space between Earth and the moon, including the moon’s surface and orbit. Any nation or entity that aims to establish a presence on the moon, or has ambitions to explore deeper into the solar system, has a vested interest in operating in cislunar space, either with communication and navigation satellites or outposts that serve as way stations between Earth and the moon.
https://www.nbcnews.com/science/space/space-earth-moon-get-little-crowded-rcna64333

There is actually a limited amount of orbital space available between the Earth and the Moon (note: capitalize it, NBC! grrr..).

So, expect more and more competition for satellites — communication, navigation, and way stations.

And of course military and spy stations.

And by the way, only eight nations signed the so-called “Artemis Accords” in 2020. Guess who didn’t?

Buckle up!

Why do all the planets orbit the sun in the same direction?

December 11, 2022
MThomas

Note: not to scale (duh). Thanks, Getty. Uh, is this really the best way to show the solar system? (There…are…NINE..planets!)

Think of pizza dough flattening into an enlarging disk as it’s tossed. Because the cloud had an initial rotation, this same direction of spin has persisted…
https://www.popularmechanics.com/space/solar-system/a39729213/why-do-all-the-planets-orbit-in-the-same-direction/

So basically the answer is simply that that’s the way they all started out.

Some moons, however, do have retrograde orbits. I.e., they orbit in the opposite direction around their respective planets. Some small asteroids and comets also have retrograde orbits due to their small mass being easily affected by larger cosmic objects.

But I bet now you’re all thinking of pizza… 🍕

Spectacular image of Jupiter’s auroras and moons

August 23, 2022
MThomas

Courtesy NASA. Note that the blue, white, green, yellow, and orange colors are artificial, only added to make features revealed by infrared stand out for human eyes. You can see the planet’s rings, aurora, and two “tiny” moons (at left; they’re not really that tiny!).

“We’ve never seen Jupiter like this. It’s all quite incredible,” said planetary astronomer Imke de Pater, of the University of California, Berkeley, who helped lead the observations.

“We hadn’t really expected it to be this good, to be honest,” she added in a statement.
https://www.pbs.org/newshour/science/james-webb-space-telescope-shows-jupiters-auroras-tiny-moons

The above is supposed to be in “quote” format, but WP really messed up this feature when they switched to so-called “block” mode (which I can’t stand).

Anyway, the image is fairly spectacular, from the new James Webb Space Telescope which is positioned 1 million miles away from Earth (i.e., in the second LaGrange point, or L2).

New mini-moon! — well, at least until we kick it out of orbit

February 28, 2020
MThomas

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He added that the mini-moon appears to have been orbiting our planet since it was first captured by Earth’s gravity three years ago. Early observations also suggest it is small enough to fit in just about any garage or shed, with an estimated diameter between 2 and 3.5 meters (about 6 – 11 feet).

The photo obviously doesn’t match the actual size of this “mini-moon” but you get the idea.

There was another one a few years ago, by the way. It stayed a few months and then got booted out of orbit.

https://www.forbes.com/sites/ericmack/2020/02/26/earth-has-captured-a-second-tiny-mini-moon/#52d80f1d58cd

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