M Thomas Apple Author Page

Science fiction, actual science, history, and personal ranting about life, the universe, and everything

Get ready for the great planetary alignment February 28th!

February 27, 2025
MThomas

Note: Planets do not line up like this…

The best day to see all seven major planets (yes, you read that right, all seven!) is Friday, February 28th.

The link will describe (and give pictures) of where to find them all in the night sky.

Finding Orion is the key to most of them. Knowing where the Pleiades are helps, too.

The next time this “parade” appears will be 2040, so fingers crossed for clear skies!

https://www.skyatnightmagazine.com/news/seven-planet-parade-28-february-2025

Venus used to have as much water as Earth. What happened?

May 7, 2024
MThomas

Over time, that water has nearly all been lost. Figuring out how, when and why Venus lost its water helps planetary scientists like me understand what makes a planet habitable — or what can make a habitable planet transform into an uninhabitable world.

https://theconversation.com/venus-is-losing-water-faster-than-previously-thought-heres-what-that-could-mean-for-the-early-planets-habitability-229342

The process in which Venus lost most of its water is called “hydrodynamic escape.” When Venus got too hot, the hydrogen in its atmosphere left. (The linked article explains this using a metaphor of having too many blankets on your bed.)

However, Venus is still losing hydrogen, even though there is too little of it for hydrodynamic escape to work. So, logically, there must be another process at work: “HCO⁺ dissociative recombination,” in which individually positively charged atoms of hydrogen, carbon, and oxygen in the atmosphere react with negatively charged electrons. The process was first examined on Mars, and based on a reexamination of results from previous missions (Pioneer Venus 1 and Pioneer Venus 2), the same research group thinks it’s time to try it on Venus…perhaps a first step to seeing whether Venus had life at some point.

Volcanos, Venus, and Earth 🌋 Hellscape unveiled

November 25, 2022
MThomas

A new study shows that massive volcanic eruptions over an extended period of time may be responsible for changing the planet into what it is today. If there was simple life on ancient Venus, volcanism was its doom. The study also shows how powerful volcanic activity has played a role in shaping Earth’s habitability and how Earth only narrowly avoided the same fate as Venus.

https://www.universetoday.com/158696/volcanoes-are-the-worst-theyve-caused-extinctions-on-earth-and-probably-killed-venus/#more-158696

Venus is hot enough to melt lead, which is why no spaceship has ever survived to land on the surface.

And, no, there is nothing alive floating around in its toxic atmosphere.

But this is a neat article. Three future missions are planned for Venus (two by NASA – VERITAS and DAVINCI – and one by ESA – EnVision, which sounds more like a song and dance competition than a scientific probe).

Venus or bust!

When planets align! Eh. Again.

April 24, 2022
MThomas

https://www.nj.com/news/2022/04/parade-of-planets-4-planets-to-line-up-in-sky-this-weekend-joined-by-moon-next-week.html

(Note: You won’t be able to see the planets actually looking like these photoshopped images…unless you happen to have a really powerful telescope in your backyard.)

Not sure why I first got this info from a site based in New Jersey. The info about what time of day and in what part of the sky is only relevant to people living in the NJ_NYC area.

Still, it’s an interesting phenomenon that occurs once every few years…

2005. 2016. 2020. And 2022. Not exactly a regular pattern, it seems.

And, no, there is no “spiritual significance” to a planetary alignment. It’s an illusion, an imaginary lining up of the solar system that doesn’t affect you personally. Sorry.

But it’s still fun to watch. Er, if you enjoy getting up before dawn (I don’t).

According to nj.com, “The planetary parade of sorts will occur when Jupiter, Venus, Mars and Saturn all appear to be lined up in a row above the horizon during the pre-dawn hours — starting Saturday morning, April 23. The alignment will also be visible during the next few mornings, and April’s crescent moon will soon join the parade, according to experts from LiveScience and AccuWeather.”

Yeah, lots of web sites are covering this. At least the one I linked above doesn’t have automated videos, flashing ad gifs, and other random pop-ups that drain your smartphone battery.

Click here for more info about the next great alignment (not as impressive as the so-called “Great Conjunction” a couple years ago, but we’ll see more planets in June and July): https://www.usatoday.com/story/news/nation/2022/04/17/planets-align-april-venus-mars-jupiter-saturn/7351117001/

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