Y’all, the article is obviously written for people in the path of totality. You’re not being clever complaining about the cost and hassle of traveling.
My wife works for the NPS and her old coworker invited us to help out with their eclipse event in Ohio. Apparently they’re already prepping to close all the parking lots and are real worried they won’t have enough rangers.
I get migraines or just started too. But never get head aches. Migraines for me just make light too overwhelming to look at but it isn’t pain. It’s almost confusion it causes me.
Had to read the article to find out that they mean 72 “years worth of orbits” happen in 1 earth day. Although unlikely I was hoping that it was orbiting so fast that 1 earth day there would pass 72 earth years to a stationary observer due to time dilation. Not sure how fast it would need to go for that to happen.
Since time and speed are relative, to have 1 Earth day on the star and see 72 years on Earth, it’d simply be a speed multiplier of 72*365.24= 26,296.28 times faster. Our solar system orbits the galactic center at 250km/s or 0.0008c, so ~26k times that puts it at nearly 22c relative to us. So no.
But quite frankly, there must be a way to be a slower observer. Earth’s orbital speed is about 30km/s (0.0001c) so that drops the product way down to 2.6c. And while the Parker Solar Probe holds the record for the fastest man made object at 0.0006c at its closest solar approach, it actually took a lot of energy to slow it down to get it to the sun and stall it’s orbit. Otherwise, it’d just orbit it the same as the Earth. It slides out to a Venusian distance from the sun at apogee and drops to 12km/s, halving the differential requirement to +1.2c. But if everything is relative, how do we even determine where 1c is and know it’s so definitively impossible to reach? I don’t know, I’m starting to have an existential crisis. Maybe time just keeps dilating and simple addition/subtraction doesn’t apply for appreciable values of c so you have to start multiplying in decimals.
Relativistic time dilation is nonlinear, so the time dilation “multiplier” approaches infinity as you approach the speed of light. So you will never need more than 1c to pass any finite amount of time for the observer while only passing a smaller amount of time for the moving object. Using a time dilation calculator, it looks like 1 day inside the moving object to 72 years for the stationary observer works out to roughly 99.9999999% the speed of light (9 nines total). Of course if you take into account earths movement as a “stationary” baseline then it’ll depend on whether you’re moving with or against the fast moving object.
It used to melt my brain too but there’s no need to know “absolutely stationary” since you’re comparing 2 objects. And due to the time dilation, the 1c limit is different depending on the observer, the time dilation will prevent anyone from observing >1c even if one person is going 0.9c relative to another person who is also going 0.9c relative to a stationary observer.
COPUOS operates by consensus, requiring approval of all of its more than 100 member states to move forward on any issue, and thus allowing even a single nation to block action
That’s a shitty way to get anything done. Unanimous approval should only be for really big issues. Otherwise just let it be a majority vote.
There will be millions of applicants for this. They’ll get the cream of the crop for this experiment. If we ever end up actually going to mars then these people will be in every history book.
Even if another life existed out there at an ideal distance to be receiving our first radio signals now, and they could receive it, and they were at a similar enough technology level…
This would also mean they were ~100LY away, or a 200 year cycle to communicate, once they deciphered our signal.
Yeah with all the time in the universe and how short our civilization has been technological I’m a big fan of the theory that the galaxy is just a big graveyard of civilizations that sprouted and died over the past few billion years. Maybe there’s another few right now dotted around but we’ll never know before we or they die out.
I mean, even if there were many civilizations, I’m betting that any that are smart enough to explore the cosmos have realized one or multiple of the following:
It’s possible to ‘explore’ a massive amount of detail without leaving your home system.
Any civilization that can communicate over vast distances also has vast capability to deliver power to an acute area.
Any civilization on the cusp of 2 is capable of ridiculous levels of distruction, and it’d be wise to make sure they’re totally peaceful before making them aware of you.
… Also, I’m a firm believer that humans and other megafauna are, well, mega. Humans are insanely massive on the scale of life as we know it, and life may not need to become so massive to never the less spread out. For all we know, Earth is a battlefield of life that is successful in the grand scheme of things, and humans et. al. are like the Death Stars of the ancient civilizations that are very much still alive.
(ok ok that last bit is very hyperbolic but it should still convey the idea!)
They wouldn’t receive the signal if they’re at the same tech level. Radiation from our communication tapers off well below background levels at 100ly. Maybe if they got lucky and had very, very sensitive instruments aimed our way at the right moment, they might detect something that didn’t fit background, but our power output pales in comparison to the cosmos.
Just look at all the tricks scientists have to pull to communicate with Voyager, and it’s not even outside of the frigging solar system, yet!
Yep. Inverse square rule has our radiation signature indistinguishable from cosmic background in a quick fast hurry. In fact, we don’t have the power to transmit anything far even on purpose!
Given there are known polar planetary discs, and this orbit seems stable, wouldn't that suggest that polar systems are formed because of some past interaction between the two stars that disrupted them from the original plane of formation?
Possibly. I didn't dive in deeper to see if they even know the shape of the orbit. From my understanding a capture is very unlikely to have a near circular orbit. But planetary discs definitely aren't captures, so something changed the stars in those.
Astronomers have generally thought that massive black holes at the centers of galaxies expel gas in jets of material only during their formative years, when the central black hole is gobbling up gas and stars and producing lots of radiation. This makes them stand out as what astronomers call active galactic nuclei (AGN), or quasars.
If, as the new study suggests, the ionized hydrogen halo around galaxies is more diffuse, but also more extensive, than thought, this implies that the central black holes may actually become active at other times in their lives.
I love how we keep finding more and more about the role that black holes play in our universe.
astronomy
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