search results matching tag: orbital

» channel: learn

go advanced with your query
Search took 0.000 seconds

    Videos (399)     Sift Talk (5)     Blogs (19)     Comments (749)   

Farhad2000 (Member Profile)

Why The US Military Made GPS Free-To-Use

Inside View of Soyuz Crew Capsule From Undocking to Landing

Ashenkase says...

Diagram of re-entry for the Soyuz:
---------------------------------------------
http://spaceflight101.com/soyuz-tma-20m/wp-content/uploads/sites/77/2016/09/6618866_orig.jpg

Orbital Module:
---------------------
It houses all the equipment that will not be needed for reentry, such as experiments, cameras or cargo. The module also contains a toilet, docking avionics and communications gear. Internal volume is 6 m³, living space 5 m³. On the latest Soyuz versions (since Soyuz TM), a small window was introduced, providing the crew with a forward view.

Service Module:
---------------------
It has a pressurized container shaped like a bulging can that contains systems for temperature control, electric power supply, long-range radio communications, radio telemetry, and instruments for orientation and control. A non-pressurized part of the service module (Propulsion compartment, AO) contains the main engine and a liquid-fuelled propulsion system for maneuvering in orbit and initiating the descent back to Earth. The ship also has a system of low-thrust engines for orientation, attached to the Intermediate compartment. Outside the service module are the sensors for the orientation system and the solar array, which is oriented towards the sun by rotating the ship.


Consequences of bad jettisons:
------------------------------------------
The services modules are jettisoned before the spacecraft hits the atmosphere. A failure or partial jettison of the modules means that the capsule will not enter the atmosphere heat shield first which can lead to a number of scenarios:
- Capsule pushed off course (by hundreds of km)
- High sustained g-loads on reentry
- Plasma on reentry can burn through the craft if the heat shield is not exposed and oriented properly resulting in loss of crew.

https://en.wikipedia.org/wiki/Soyuz_5
https://en.wikipedia.org/wiki/Soyuz_TMA-10
https://en.wikipedia.org/wiki/Soyuz_TMA-10

NASA | Earthrise: The 45th Anniversary

bareboards2 says...

My dad was part of the unmanned missile program. I'm still email buds with one of his co-workers (now 91 years old!) They do talk amongst themselves and this was forwarded to me:



I was working at Kennedy Space Center for McDonnell Douglas and worked on the launch of this mission. I was a Guidance and Controls Engineer on the console in the firing room (the Launch Control Center). McDonnell Douglas built the S-IVb stage….the upper stage….and the one that restarted when in orbit to send the Command Module and Lunar Module on their way to the moon….



Kim Keller

Racist is what you do, not what you say.

C-note says...

Associating a fact with other claims does not make it any more or less true. And use of the dismissive tactic of calling a person crazy has been bestowed upon many. Yet the earth does orbit the sun and humans evolve and most impotent of all ...

No white male police officer has ever been convicted of murdering a black male in america's entire history.

ChaosEngine said:

...
You don't have to give every opinion equal validity, you can easily dismiss certain ideas.

Creationists? Crazy. Dismissed.
Homeopaths? Crazy. Dismissed.
Climate Deniers? Sneaky disingenuous fuckers who are either crazy or lying through their teeth. Either way, dismissed.
Alex Jones? Batshit fucking insane. Dismissed.

You? Either crazy, ignorant or trolling, but you've certainly used up all the good will that was extended to you to prove your case. So yeah.... dismissed.

Cat Rescues His Sister From The Nasty Vet

SpaceX - Historic Flight and Landing of Reused First Stage

Whole New Worlds: An Aladdin History of Exoplanets

eric3579 says...

Wasn't easy being a planet hunter back in the day *promote

I'm looking for
1 tug
The pull of a planet
1 tell
A wobbling sun
I've searched for years
Haven't found a one
But they're out there

1 jump
In radial redshift
1 slip
Of spectral lines
They'll see if I can show them the sines

Pish tosh
Green men
Take five
Take ten

Just a little cash guys

Budget's tight
Don't fund this trash guys

I can take a hint
Better face the facts
Second-hand'll have to do

Eww
All you planet hunters at the bottom
You've got fact & fantasy entwined
Finding planets except they haven't got one

Well they gotta be forming readily
When you think about it given we've got nine

1 jump
A blip in the spectrum
1 shift of meters per second
1 graph of period power
They laugh but I'm not sour

Here goes
18 months of data
Cross & correlate it
All I gotta do is run

Pish tosh
Green men
Ah don't mind them
If only they'd look closer
Would they see a pure void
No sirree
They'd find out
There's worlds galore
To see

Make way for Pegasi
51 Pegasi

First was a world
Round an old pulsar
That's true
But the news
Is a sun-like star
With wobble
Too quick & precise
To be designed
No fluke not a spot
If you like it hot
You're gonna love this find

Pegasi 51b
Planet discovered
Orbit traced
Every 4 days
Hot as can be
Its order-Jupiter size
Was something of a surprise
Especially given its star's proximity

Pegasi 51b
It's a new era
To detect
Exoplanets
Soon there'll be three
As planet pulls on its Sun
It shifts the stellar spectrum
That's how we found 51b Pegasi

How'd a planet get so close in orbit
Cause I thought you needed ice to form it
Did it later undergo some strange migration
Star too small to be so long-pulsating
And too old to be so quick rotating
Is there any other good interpretation

This will certainly help with our funding

We got your funding
We got your funding

Got a surface of 1200 C

It's treacherous
So treacherous

If in time this new breakthrough feels mundane
Planets are common

That's proof
Of the truth
I've been telling you
This is no mean anomaly

Pegasi 51b
Planet uncovered
Round a far
Main sequence star
Spectral type G
We know its mass to be high
Half Jupiter by sine i

It's 15.61 pc from home
And it shakes our faith in how planets are formed
And its star is in Pegasus
Give it an A and thus
Label the planet as b
51 Pegasi

Plotting Doppler shifts is glacial-pace
And that astrometry never prevails
But baby you're in luck cause
Up in space
You got a planet-finder never fails

You got the power of statistics now
You got a view without an atmosphere
So no more nights spent locked up in your tower
All you gotta do is wait right here
And I say

Kepler the planet-searcher
Got a dip, no 2, no 3
We just measure brightness
Plot it out & that's transiting photometry

When your stars do this
And your curves displace
Then your star's got this
Transiting its face

Then you hit compute
And lookie here

You get good diameter data
From that dip
And orbit distance from the length of year

Well now we need this tale supported by
A ground observer with a good Échelle
We got 2000 planets certified
2000 more that only time will tell

But let's take em all, plot em out
And find out if we're really all alone
Is there a rocky world we've found no doubt
That orbits in the habitable zone
Like home?

Kepler the planet searcher
Got an Earth 452b
Part of a throng
40 billion strong

There ain't never been a field
Clever as the field
There ain't never been a field
Better than the field they call
Exoplanetology

I can show you a world
A shining shimmering planet
Found concealed in the band-shifts
Of the closest star in sight

I've found hope in the skies
And facing wonder I wonder
Could the sine wave discovered be
A planet fit for life

A whole new world
A new fantastic point of blue
Placed in that narrow zone
Where water flows
Midway tween cold & steaming

A whole new world
Its sun a faint, reddish hue
Could there be waiting here
A biosphere
Evolving in this whole new world to view

Fathoming a whole new world to view

Unbelievable find
Indescribable feeling
Earthlings someday revealing
Through directly captured light
A whole new world

Don't just stare from a far

Though nigh impossible to see

Wouldn't close up be bolder

Next to its parent's flair
If life is there
We'll know through atmosphere spectroscopy

A whole new world

Block the glare of the star

A laser starshot to pursue

With a star-shaped occulter

Chasing that crazy dream
That's always been
Of walking in a whole new world with you

a whole new world
That's where we'll be
A thrilling chase
A home in space
For you and me

How Close Can You Orbit A Black Hole?

Where Be Aliens?

RFlagg says...

My long time issue with the "they would be too intelligent/evolved to have any interest in us" type scenario, such as he puts as number two here, is that we go through great lengths to try and research and understand very primitive life. There are efforts being made to talk to dolphins and apes. We're looking to build ships to crash or land ships onto Titan to see if there is microbial life on a moon orbiting a gas giant, not to mention work to see if Mars once upon had life. So the very fact we're able to get off our little rock (though not much off it), I think would warrant a stop and look, perhaps to help answer what was life like at such an early stage of evolution.

Not said stop and look doesn't imply any sort of communications. Indeed there may be a Prime Directive like thing with them where by they see and observe, but leave no evidence of such a visit (alien abductions being just mental illness coupled with abuse or other issues).

Now distance is a super valid point, but by far the most likely point is the survivability window, which he talks about in point three. We're still a level zero civilization (Kardashev scale) and decades until we reach a level one civilization (unfortunately it seems delayed even further due to some very anti-science moves being made by certain groups). Moving up that scale is only one thing, avoiding killing ourselves via war is another huge one. With CRISPR technology advancing, there is a very real danger of a Division/Stand/Utopia type disease coming to the foreground, especially if driven by a zealot (ala Division and Utopia). I highly doubt a man made black hole or something, but war or a CRISPR engineered disease... Not to mention the natural disasters he mentioned, and others, such as huge gamma ray bursts and others that we've managed to avoid. And we'd have to think that most civilizations go through somewhat similar phases, with a universe that is fairly hostile to life, even if many planets are capable of at least starting life. Generally I figure that most civilizations never make it past the stage we are at now, and those that do probably don't get to stage two and beyond (to be fair, I doubt any civilization can achieve stage two on Kardashev's scale as it goes beyond knowledge needed, but materials and more).

Back to the technology of communications point. I've generally figured if you are space faring, you gave up on radio communications and are using strange properties or something along those lines.

Massive spider infestation in backyard - Eradication Time!

Welding in Space

oritteropo says...

Since I quite enjoyed the talk I'm willing to overlook that fact He did also have some good examples of actual cold welding.

NASA has an interesting lessons learned article about the Galileo high gain antenna failure, which also seems to be more nuanced than "it was cold welding" - http://llis.nasa.gov/lesson/492

p.s. I got curious about the reference to Gemini, and I'm not 100% sure but I think it might come from a 1991 paper "On-Orbit Coldwelding Fact or Friction?" by Dursch, H. & Spear, S. (Bibliographic Code: 1991NASCP3134.1565D) or else it's from the paper it references as ref 5 (I. Stambler "Surface Effects in Space", Space/Aeronautics, Vol 45 No. 2, 1966 pp. 63-67).

That paper gives the opposite impression to the start of Derek's talk, rather than cold welding being discovered around the time of Gemini, it was often thought to be a problem around that time but as he says later was subsequently found to be quite rare (Dursch and Spear found no actual cases of cold welding causing spacecraft issues, they were usually friction issues due to fretting or galling caused by loss of lubricants, but still recommended taking precautions to avoid coldwelding).

artician said:

Wait...

Uses an example of cold-welding to set the premise for the talk.
Psych! - Example was not actually cold-welding.

His second example, the Galileo Jupiter mission, didn't explain why we *thought* cold-welding was a result of a malfunction, and I've no idea how that information would come about because the craft never returned to earth.

wtf? Are these shows really getting so bad? I had more respect for this guy.

Why ALIENS Is the Mother of All Action Movies

dannym3141 says...

I have only one complaint. Calling "Get away from her you bitch!" the most famous line underplays the fact that this film is chock full of the most quotable lines in film history.

Compared to just about anything Apone says, also Hudson and many from Hicks, that line is pedestrian.

-"I like to keep this handy, for close encounters."
-"How do I get out of this chicken-shit outfit?"
-"Game over man... game over!"
-"Well why don't you put her in charge?!"
-"Me and my team of ultimate bad asses are here to protect you!... We got nukes, we got knives, sharp sticks," etc.
-"I say we take off and nuke the entire site from orbit... it's the only way to be sure."
-"A day in the Marine Corps is like a day on the farm. Every meal's a banquet! Every paycheck a fortune! Every formation a parade - I LOVE THE CORPS!"
-"What do you want me to do, fetch your slippers for you?" etc. and "Look into my eye......"

I'll stop before I end up pasting the entire script.

Edit: One final complaint - i consider Aliens to be tarnished by associations with modern wonder woman, which IMO was indicative of the abject failure of rich Hollywood males to produce a worthy female superhero.

Elon Musk: Making Humans a Multiplanetary Species

AnomalousDatum says...

Well, to be fair, we don't have any real idea of the living conditions on planets in nearby systems that are roughly earth sized. We haven't been able to detect them until the last few years, and most of those are orbiting too close to the sun (because those are the easiest to detect), and getting any kind of real idea of their atmospheres is currently unavailable. There could be several systems with habitable planets within 30 ly, we just don't know yet. We are improving our capacity to detect these every year, so perhaps by the time we have colonized Mars, we should have a few viable extra-solar earthlike planetary candidates to send probes. Still would be another 50-100+ years after sending probes to receive back enough data to justify sending colonists. Hopefully by then our tech has matured enough to make it possible, and the war with Mars has settled down enough.

Portia Spiders Are Capable of Learning and Problem Solving



Send this Article to a Friend



Separate multiple emails with a comma (,); limit 5 recipients






Your email has been sent successfully!

Manage this Video in Your Playlists

Beggar's Canyon