John F Kross

1.7K posts

John F Kross banner
John F Kross

John F Kross

@johnfkross2

Weird career path. Child of Apollo era. Trained as oral pathologist. Retired from medical communications. Now, Contrib Ed with Ad Astra magazine (my dream job).

Beigetreten Kasım 2019
105 Folgt70 Follower
John F Kross
John F Kross@johnfkross2·
Yes, CDR Wingstrong piloting LM Bumblebee in search of a safe landing zone.
English
0
0
0
10
John F Kross retweetet
End Wokeness
End Wokeness@EndWokeness·
The NFL just condemned this speech by Super Bowl champion Harrison Butker. They 𝐫𝐞𝐚𝐥𝐥𝐲 don't want people to hear it. It would be a shame if you make it viral.
English
2.1K
25.2K
73.4K
3.7M
John F Kross retweetet
National Space Society
SPACE AUTHOR & HISTORIAN ROD PYLE TO RECEIVE NSS' SPACE PIONEER AWARD AT ISDC-2024! Pyle is being awarded NSS' prestigious Space Pioneer Award for Body of Work in Media, incl 20 Books, NASA Publications, Recording Space History & Excellence in Journalism. t.ly/cMQ9J
National Space Society tweet media
English
4
6
22
2K
John F Kross
John F Kross@johnfkross2·
@DrPhiltill Better odds than some combat missions and the Apollo astronauts virtually all came from a military background (fighter jocks).
English
3
0
4
226
Phil Metzger
Phil Metzger@DrPhiltill·
Yesterday talking with Jim Head, planetary geologist at Brown University: he talked about his experience training the Apollo astronauts. They told him they wouldn’t have agreed to go unless they had an 80% chance of coming back alive. That’s still pretty low!
English
17
17
182
12.4K
By Grabthar's Hammer
By Grabthar's Hammer@RealAceFox1·
@TheRealBuzz So much hinged on the outcome of that battle. If Yorktown had been sunk instead of damaged then only the Hornet and Enterprise are at Midway. If not for Coral Sea then Japan would have had the carriers Shokoku and Zuikaku at Midway. 6 carriers vs 2. youtu.be/U0K0Sqsg4cU?si…
YouTube video
YouTube
English
2
0
10
445
Dr. Buzz Aldrin
Dr. Buzz Aldrin@TheRealBuzz·
This week in May of 1942 saw the Battle of the Coral Sea – one of the pivotal battles of WWII. Important for a few reasons, Coral Sea was the first major engagement in the Pacific, and demonstrated what modern, air-sea combat would look like the remainder of the war and beyond. America lost the carrier USS Lexington on May 8th – but the Yorktown, wounded in the fight, would be quickly repaired for Midway, demonstrating the industrial might of America. Lots of lessons we can learn from today.
Dr. Buzz Aldrin tweet media
English
21
134
901
37.2K
John F Kross
John F Kross@johnfkross2·
@DrPhiltill How are these equations different from a truncated Drake equation?
English
0
0
0
17
Eric Berger
Eric Berger@SciGuySpace·
@lrocket Also interesting that he said the cost is $20 million per launch, which feels about right to me.
English
8
4
224
14.1K
John F Kross
John F Kross@johnfkross2·
@SciGuySpace Now, boosting HST to a higher orbit would have pushed the boundaries.
English
1
0
0
464
John F Kross
John F Kross@johnfkross2·
@SciGuySpace And the outcome is less predictable than the first space race round. China, with their LM-scale lander, will surely land on the moon by 2030 and probably before (2029 is 80th anniversary of the PRC). Not at all sure Artemis will beat that date.
English
0
0
0
47
John F Kross
John F Kross@johnfkross2·
@BellikOzan Yea, that's true, but also the boilerplate Orion on EFT reentered at 14k mph, if I'm not mistaken, not 25k mph with exponentially less heating (and shear too, I assume). Just a bad decision. Apollo deliberately burned SPS's engjne to test the heat shield at lunar return velocity.
English
1
0
4
73
Ozan Bellik
Ozan Bellik@BellikOzan·
@johnfkross2 It wasn't so much that they didn't simulate close enough with EFT (although it was a somewhat different trajectory), but that they radically changed the heat shield design afterward. x.com/BellikOzan/sta…
Ozan Bellik@BellikOzan

@daniwestastro Oh it gets better. They used a honeycomb originally in the Orion capsule qualification flight in 2014. Then they switched to blocks to "improve" the process in a "low risk" way but didn't bother to flight test again until SLS was ready for Artemis 1. ntrs.nasa.gov/api/citations/…

English
1
0
2
109
John F Kross
John F Kross@johnfkross2·
@BellikOzan Have to wonder why EFT did not simulate a lunar return and whether heat shield problems could have been uncovered at that time instead of months ahead of a crewed mission.
English
1
0
0
72
John F Kross
John F Kross@johnfkross2·
@robert_zubrin @anders_aslund Make it make sense. I sometimes wonder if it is deliberate sabotage or ideological blindness or incompetence. And then I realize they are not mutually exclusive.
English
1
0
0
2
Robert Zubrin
Robert Zubrin@robert_zubrin·
@anders_aslund Of course the people in the Biden White House are thinking. They think that Russian oil is carbon free. So by replacing dirty American oil with clean carbon free Russian oil they are saving the world from the existential threat of climate change.
English
4
1
14
817
John F Kross
John F Kross@johnfkross2·
@spacekoala Agreed. Also, a large jovian-type planet to shepherd asteroids away from the inner system. IMO, stable Earth-like planets are extremely rare, and intelligence takes eons to emerge (at least a sizeable fraction of the age of the universe if Earth is any guide).
English
0
0
2
26
Yatharth Mann
Yatharth Mann@yatharthmann·
SpaceX or Boeing, which space suit do you like?
Yatharth Mann tweet media
English
694
81
1.1K
334.4K
John F Kross
John F Kross@johnfkross2·
@GregWAutry What makes the SoCal to LV train different from Newsom's folly? Serious question.
English
0
0
0
13
Greg Autry🚀
Greg Autry🚀@GregWAutry·
New SoCal to Vegas train will be built much faster and far cheaper than Newsom’s “high speed” folly, which will die rusting in the Central Valley after burning billions. abc7.la/4b5DvBO
English
11
2
26
1.2K
John F Kross retweetet
BryceTech
BryceTech@_BryceTech·
In 2023, 97% of launched spacecraft were smallsats, showcasing substantial industry expansion. Learn more in the latest Smallsats by the Numbers report: bit.ly/2WeKYe9 #Smallsats #BryceTech
BryceTech tweet media
English
1
10
13
1.7K
Mr.Hrmpf
Mr.Hrmpf@MrHrmpf·
@SPACEdotcom Americans on the moon would be worst case. This culture only brings violence, racism and hatred. It's enough how much they harmed 1 planet already.
English
2
0
0
6
John F Kross retweetet
SPACE.com
SPACE.com@SPACEdotcom·
Are we prepared for Chinese preeminence on the moon and Mars? (op-ed) trib.al/XAdH4PL
SPACE.com tweet media
English
14
22
93
19.6K
C4ne
C4ne@Mr_K4ne_·
@SPACEdotcom If Republicans have any say, China will easily beat us
English
1
0
0
38