Re: Speed Of Light
If they can get a few pictures of it, along with when the picture was taken, they can get an idea of what the orbit is. Then they can send signals to it when it is at least on the earth side of mars.
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Ok, i had to look it up and found out it's what I call a drill press (US name?). I bought mine to make PC boards. Drilling small holes with tiny drill bits works better with a drill press. Your drill bits break less often.
And a drill press makes it easier to drill holes where you want them to be when making things out of wood or metal.
> So, two lasers and if that fails, your on board system does the maths from reliable data, extrapolates and guesses what to do next.
Two lasers or at least a second altitude sensor, radar maybe? Something to increase your odds of getting data. And plan for dust getting kicked up.
And yes, have an on board computer plotting what it's supposed to be doing, and ready to take over quickly if the the data looks corrupt. Then it takes it's best guess of bringing it in safely.
> Crumple zones are not just for cars.
Or do it like they did on some of the Mars landings. Cover it with bouncy balls. ;-) You do have to make a ball that can handle the temperature extremes. So maybe you would need to use springs. Wait, temperature extremes problem again...
Raccoons help the squirrels out sometimes.
It was a clear calm day and the power company said it must be a problem with our wiring. No one else had a problem. So I check for voltage at the cartridge fuses under the meter. No voltage there so I called them back and finally got them to come out.
They noticed the fuse(/breaker?) feeding the power transformer on the pole had blown. So they used a bucket truck to get close enough to fix it and saw a hapless "red shirt" raccoon laying in the tall grass below.
It is happening right now. That was the plan all along. Otherwise LEO would get filled up.
See: spaceweatherarchive.com/2025/02/19/unprecedented-starlink-reentries/
"First generation (Gen1) Starlink satellites are being retired to make way for newer models. “More than 500 of the 4700 Gen1 Starlinks have now reentered,” says McDowell."
Apparently getting 2 or 3 coming down some days.
I hiked to the top of Mt Washburn in Yellowstone Park this summer. Great cellphone signal as the cellphone antennas were on top of the ranger lookout station on top of the mountain. The view wasn't so good as there was a lot of smoke in the air that day.
Is supposed to only get to within 0.8 LD of earth on June 29th. It's a "little" one that's only 162 meters (big error bars on the size estimates).
FWIW, meteor crater in the US was estimated to be 40 yards/meters. Crater is about 1/2 mile across.
I check Spaceweather.com every day and this one just showed up. So maybe enough time to figure out where it will hit. If it looked to be hitting us.
Well design it as a noise canceling DC. Would be to too expensive to have Bose noise canceling headphone for each hard drive. And it would reduce cooling effectiveness. ;-)
Real-estate costs would up the cost of building on shore. And building on shore you have to consider hurricanes, rising ocean levels and tidal waves. All doable if you consider them early on and not after starting building.
To expand on what Paul said. Satellites use old school spinning gyros to point the satellite in different directions. Saves on having to have lots of fuel to use thrusters to change direction. Especially important in an astronomy satellite that constantly changes direction to look at different things.
I have fiber optic to my house and I live in rural Iowa. About 3 miles out from a town population 760 and the next town has about 7600 people. It's a local company so that's why we have fiber here. You can get phone Internet and cable TV from them.
Not an easy to read map but it looks like they provide fiber internet in most of a roughly 14 x 11 mile area. But there is a big hole in that of 5.6 square miles. They don't provide fiber on the lake.
But I saw a person run a red light with a police car beside or behind them.
Not sure which because I was about to turn left when the left turn arrow turned green. I was glad that I saw them in time to stop. And I was unhappy at first that two cars went through the red light. Until I saw the second car was a police car with it's light on. ;-)
I have seen it one other time. But then I'm a bit paranoid at left turns now.
I had a bigger one come down near me in late 1992.
I was inside so I don't know if it was raining. But reports on the news said people saw the clouds light up. I just remember the big boom. Sounded like a sonic boom from a supper sonic jet.
I looked out the windows to be sure neither of the two big (yard wide) natural gas lines within a mile of the house had a giant fire raging from a leak.
I remember the year because I was changing my first born kids diaper at the time.
Learned a bit about the Burroughs systems after the merger with Sperry. Apparently some people had a hard time believing there wasn't an assembler.
It can take a bit of time to wrap your head around that. But hey, the compiler writers just need to know what binary to put out. Not much different then spitting out assembler code.
Best tool for anyone drilling or nailing into walls. Non-contact AC Voltage detector, I like the adjustable voltage one. You can make it more sensitive for 24 V AC wiring or less sensitive to get a better feel for where a wire is. Never assume it's 100% right, but they are wonderful.
I first learned about them when I was having my dead dishwasher replaced. The installer used one to test that we had the right breaker turned off. The dishwasher was hard to turn on, so we couldn't just try to turn it on to be sure the power was off.
Bah!! I maybe older.
My first pre IBM invented small computers was an RCA 1802 based COSMIC ELF running 3.579545 MHz. It could have run 6.4 MHz but by using the color burst frequency you could drive a regular TV from the "graphics co-processor" chip. Really a DMA driver chip that with the processors help could clock out bits and sync pulses.
All this worked with 4 K of RAM and about 2 K of EEPROM. I soldered all the chips onto the two boards. Only missed a couple of pins on the first go. ;-)
Speed was not that blazing as it used 32 clock cycles per instruction.
No shift lock key, It had a HEX keypad with a few other buttons. I wonder if the tiny basic cassette I never used is still readable...
Plan on buying at least 2 or 3. One can fail and you are out of luck if you find out after your PC dies to.
And you need to take a copy off site from time to time.
Houses can burn down, get hit my lightning or be damaged by storms.
Or even hit by a car. Saw the video of that a few years back. Car hit the second floor. The house was on flat ground. But the divide road by it had a curb and the car was going way too fast.
If you have an old fluorescent fitting just replace it with LEDs when the bulbs need replaced.
You can get LED tubes that fit in place of the fluorescent tubes. I plan to use the LED tubes that are made to be direct wired to AC without the ballasts. Some of the LED tubes are made to work with the fluorescent ballasts, but then you need to have a working ballast.
That may be the bad news to. With so many possible battery chemistries it takes a long time to find the few good enough ones. And that does not include the time to figure out the non-chemical variations of all those chemistries such as making the anode/cathode with the right sized pores for that chemistry..