Even when I was growing up (in the 1950s) my first impressions of astronomy were formed by illustrations of the solar system--shown from a point of view outside the system, with the orbits displayed as brightly colored, ellipses
Now that would be cool; standing at a point where the ecliptic plane is right overhead, and seeing a bright red ribbon erupting from the ground, extending straight up as far as the eye can see. The eruption point would move at 1600 km/h and the ribbon itself would move up at 29 km/s. I'm so disappointed this doesn't happen
The numbers gathered by the Nazis in WW2 agree with the numbers gathered after the war by people unsympathetic to the Nazis. How much more confirmation do you need before you cross the line from sceptic to denialist?
Troubling is that most everyone on the street will know what happened to Jews in WW2 if you ask.
In the Western world, maybe. Denying the Holocaust is still a popular pastime in e.g. the Arabic world.
There's still an option to allow exact searches: Search tools->all results->Verbatim.
Drives me nuts too, I'll have to figure out how to specify that in the URL so I can at least call the page with that option already switched on.
You can see the RCS in action in this video
At first glance, it would seem that a circular orbit can still lead to varying tidal forces. The only requirement is that the planet is not tidally locked to the moon (i.e. the planet's rotation is not in sync with the moon's orbit). Or am I overlooking something?
The recoverable version (F9R) has a set of cold gas thrusters. Other than that, not much is known. See this page
I'd be really "easy" to land if they had an RCS, just a couple seconds worth to cancel out any lateral movements and rotations
In its current configuration, the stage can't hover: on its lowest thrust setting, the engine still provides too much thrust. So they land using a "hoverslam" maneuver where they try to decelerate to a vertical speed of 0 just as the stage intersects the barge.
There is an RCS at the top of the stage to keep the stage upright, but any lateral thrust at the bottom has to be done by gimbaling the main engine. The gimbaling angle is limited so they may have run out of control authority on this landing.
The only thing you can remotely call a "day" on the ISS is about 90 minutes long.
The astronauts are on a 24-hour work/sleep cycle. It may not have anything to do with sunrises and sunsets anymore (1), but is there any reason other than extreme pedantism to not call that cycle a day?
1: other than the sunrises and sunsets over the control centers in Houston and Moscow.
An extended play tape cassette could store 3 hours of audio per side
I'm sorry, a what now?
The Compact Cassette standard had one tape speed (4.76 cm/s). Readily available cassettes came with 60-minute or 90-minute runtimes (total). You could get C-120 cassettes with 1 hour per side, but those used extra-thin tape that jammed easily. The longest tapes ever made were C-180, for 90 minutes per side, these used even thinner tape and so unreliable they never sold widely.
I've never seen one, and I was a bit of an audiophile in those days.
You'd have to combine a C-180 tape with a non-standard playing speed (used only in dication machines) to get 3 hours per side.
But Esperanto hasn't succeeded, so we'd need a new language loosely based on it. Let's call it....
Excel (first introduced on the Mac in 1985) was a huge step forward from Lotus 1-2-3. Word (first graphical version also on the Mac in 1985) blew WordPerfect right out of the water.
Developing these for the Mac gave Microsoft a taste of what a GUI could do, which was much more than Lotus and WordPerfect were doing with their crappy GUIs grafted onto CLI programs. Even by 1990 and Windows 3.0, Lotus and WordPerfect still stank.
That they bundled Word and Excel in 1989, whatever. The real innovation happened years before.