Become a fan of Slashdot on Facebook

 



Forgot your password?
typodupeerror

Comment Possibility vs mandatory (Score 1) 351 351

I don't see any problems to give to everyone the possibility to build software. That does not means that everyone will do software. Do you think we should make it harder for people to learn to cook (almost everyone has the possibility to learn this) to protect the job market of cooks?

Comment Re:This should be a major embarrassment (Score 2) 72 72

I agree with you for point 1 and 2.

But for the point 3, it looks like they actually designed the power supply to keep the batteries charged. They just have reach a level where the safe power mode has been activated, disabling all non essential function from the spacecraft. (it's a design choice to consider TM/TC as critical or not, I would say that it should stay on, but it can be discussed) Note that reaching a charge level that low could be linked to the fact that they have lost for several days the contact due to 1 and 2, which has delayed the SA deployment. (I haven't look in detail the design of the satellite, but usually a satellite get less power when the solar array are not deployed)

And for the point 4, it's a "design" choice. They have looked for a cheap launch to test a first version of their satellite, and found that one.

Comment Re:Seriously? (Score 1) 366 366

That being said, it is shoddy programming to blindly write to a log on a resource-constrained embedded platform (or any platform, really. Just especially so on something like this), so somebody definitely goofed.

Maybe they did not blindly write log on a resource-constrained embedded platform. Depending on how much memory they had, and how short the mission duration was, they could have computed that 32MB/(2d) * length_of_mission was sufficiently smaller than available_space

But as a test engineer in the space industry (having working on big and expensive and too much paperwork satellites, not on the new space version of cheaper, less doc and simpler tech, which really looks interesting, but I don't know to what extend they test) I'm really surprise that they did never saw this bug before. They never run a rehearsal for more than two days with a sufficiently representative model ? Maybe this bug appears only once every [n] times, with n sufficiently big. Anyway, it's strange, I hope they will get an opportunity to patch it after a reboot, I'm interested in the results they could got from solar sailing.

Comment Re:and yet, the GOP blocks private space. (Score 1) 96 96

It cannot be due to the Western embargo. Here is a quote from Putin: “The response of the Russian Federation to Western sanctions is legal and valid. It will help, and not harm our domestic economy,

The russian space industry being part of the russian domestic economy, the embargo cannot be the cause of these failures

.

Comment Re:Deniers (Score 2) 525 525

What I am trying to say is that "an inaccurate scientific prediction is wrong by definition, i.e. it cannot be used to prove anything." is false. An inaccurate prediction is not wrong, it is inaccurate. And yes you can use inaccurate results or prediction in science, to further develop.

Comment Re:Deniers (Score 1, Interesting) 525 525

We should then ask Englert and Higgs to give back their Nobel price? If I remember correctly, their initial paper did not even proposed a mass for the boson. The firsts experiments later only concluded that its mass, if it exists, was "not below 18 MeV/c. This kind of statement is so inaccurate [18MeV/c to infinity, quite a large uncertainty] that it's not science, by your logic?

Comment Re:Very myopic study (Score 1) 280 280

"“When you consider all of the man-made radiative forcing and all the changes we’re making that can affect climate, contrails are one of the smaller effects, compared to carbon dioxide and other emissions,” Spangenberg said. “Globally, you would have to increase the contrail effect by roughly 100 times to get the same effect as all of the anthropogenic carbon dioxide in the atmosphere.”"

Comment Re:Masstransit is more energy efficient than perso (Score 1) 280 280

The energy consumption of a takeoff depend on the mass of the plane at that time (I think), so for a given plane with a given number of passenger, it's not exactly independent of the distance. (more fuel needed for longer distance, bigger take off mass)

Comment Re:With REALLY Huge Fans... (Score 1) 280 280

You speak about aerospace where you should probably speak about aeronautics. In the aerospace sector, people rely a lot on non carbon energy, except for the launch part. Of course a launch is a big energy consumption in a short period of time, but on the other hand the S/C will usually be used for 10+ years, running on solar energy. And more and more S/C use "electric" propulsion, where you have still a "fuel" of course, but most of the delta-V comes from electricity.

There are some people who want to use renewable also for launches. Or at least it's a side effect of trying to simplify/reduce the launch cost. For example zero2infinity is planning to use balloon for launching rocket from high altitude, avoiding the dense atmosphere (even better, they use it) and the drag, and also starting from higher slightly reduce the delta-V.

After an instrument has been assembled, extra components will be found on the bench.

Working...