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Dr. Phil Metzger
@DrPhiltill
, 3 tweets, 1 min read Read on Twitter
We're back at the cancer center due to some complications (getting better, though!) and the onco nurse Jennifer was asking why it is so hard to land a rover on Pluto. I was explaining about the need to carry lots of fuel to slow down to go into orbit & how expensive that is.../1
2/ She says, "I wonder if you could send a rocket that would land on a planet, do its own maintenenace, fuel up, and hop to the next planet. Is that possible?" Wow!

We told her that's EXACTLY what we've been working toward with the recent "steam powered asteroid hoppers"...
3/ So we showed her the recent headlines about the steam-powered asteroid hoppers that re-fuel themselves and keep exploring. She said "WOW, I GUESS GOING TO SPACE CAMP PAID OFF!" 😄😄😄

Yes, she went to @SpaceCampUSA. It's super cool our oncology nurse is a Space Camp graduate.
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More from @DrPhiltill see all

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Dr. Phil Metzger
@DrPhiltill
1/ I just stumbled on these pics I took 3 years ago at a public pool showing the waterfall feature. There's some awesome science in this.
2/ I was amazed to see how a simple iPhone camera can freeze the falling water with enough clarity to see the physics of these sheets of water as they tear and fragment.
3/ The basic part (not the part that amazed me) is that as the water falls it speeds up and therefore the sheets have to get thinner and thinner until they tear. You can see this with the flow from a water tap in your house. The stream gets narrower as it falls, as it speeds up.
Read 22 tweets
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Dr. Phil Metzger
@DrPhiltill
Yes, I've done thruster blast tests on many lunar landing pad concepts including sintered soil, oven-sintered pavers, gravel, compacted soil, polymer infused soil, and fabrics. @paulvans and I spent a summer doing some of these tests. Some tests were done on a volcano😅
Back around 2010/11, our team spent a couple weeks at @mastenspace installing coupons of simulated lunar construction materials onto their landing pads. They hovered a rocket over the coupons. Some of the materials survived the blast. The other materials? Well let's just say...
3/...the other materials responded to the supersonic, searing blast of rocket exhaust "less than optimally." (They were never found.)
Read 6 tweets
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Dr. Phil Metzger
@DrPhiltill
Lunar landing ejecta of large craft can even destroy spacecraft that are ORBITING the Moon, like @LRO_NASA, unless you can time the Collision Avoidance (COLAs) correctly. We put this into NASA's guidelines for Moon landings. See page 15: nasa.gov/directorates/h…
2/ This is why we need international agreements ASAP where we agree to hold each other harmless for some degree of ejecta spray that we put onto each other's lunar hardware. We need to agree to design all our hardware to handle it, and that it's our own fault if we don't.
3/ Because it is simply impossible to do major lunar activity without putting spray all over the Moon onto each other's hardware. This is because the Moon is unlike Earth: NO ATMOSPHERE to stop the super high velocity dust that comes from a rocket engine during landing.
Read 6 tweets

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Dr. Alison Bateman-House
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Tinu Abayomi-Paul - I voted!
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#HealthCareWhileColored. A thread.
I was going to do this hours ago. Then I thought about stories from my life and I was overwhelmed.

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Tinu Abayomi-Paul of Wakanda
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You know what's great? When you grow up and your Dad is your buddy.

Just got off the phone with him a while ago. He let me vent & then I listened to his venting & I'm cheered all the way up.
Like, as a grown up I now have the language to say "I haven't called because I was depressed and feeling useless because I can't work & one little pill could change that. But the anti-depressant is kicking in and I'm getting better.
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Victoria Brownworth
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I gotta tell you, folks, I have been so sick for the past 2wks, I have really been scared.

Sept 22 House GOP passed their new cuts to Social Security Medicaid and Medicare out of committee. $1.2T in cuts.

That's the safety net.

I've always hoped I could fall there. No more.
I had to call my bestie today to have her come up and stay with me while The Wife is teaching.

Even with the oxygen, hard to breathe.

I had to cancel interviews for tomorrow, a radio appearance for Friday.

Chronic illness like #cancer is incapacitating at times.
We need to do better for sick and #disabled Americans.

It is so hard to work and be sick.

Never getting better sick.
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Thandekile Moyo
@Mamoxn
Rural development is the key to Africa's development! A thread...
Urban areas are human settlements with high population density and high settlement/building density. Whatever is not urban is considered rural.
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