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, 6 tweets, 6 min read
A short thread with art by Alexei Leonov and Andrei Sokolov

1. Earth Orbit
A short thread with art by Alexei Leonov and Andrei Sokolov

2. Solar System
A short thread with art by Alexei Leonov and Andrei Sokolov

3. Advanced Spacecraft
A short thread with art by Alexei Leonov and Andrei Sokolov

4. The Moon
A short thread with art by Alexei Leonov and Andrei Sokolov

5. Rockets
A short thread with art by Alexei Leonov and Andrei Sokolov

6. Various
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More from @Nick_Stevens_Gr see all

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NickStevens Graphics
@runnymonkey
Lunar Escape Device
An unused design for an Apollo emergency escape system, to get people off the Moon if the LEM broke.
Some reference images for the Lunar Escape Device
And a couple of my renders of the Lunar Escape Device.
Read 3 tweets

Related threads

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Jenny Chase
@solar_chase
1. Time to make minor updates to my #solar unpopular opinions thread, since this seems to be a good way to organize thoughts.

If you like these, you’ll like my book, Solar Power Without the Jargon. tinyurl.com/y4bsswty
2018 #unpopularopinions: tinyurl.com/y5nh3axb
2. Solar Power Without the Jargon is the book I should have read before seeking a job in renewables, from the perspective of having worked in this for 14 years. It’s short and not too serious; one reviewer said it “made me laugh quite a few times”.
Read 40 tweets
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Jeysundhar
@jeysundhar_d
It’s that time of the year again! The 9 days of festivities, Navaratri is here! Celebrated in various parts of the country in various ways, the festival is special for several reasons. #Navratri #Navaratri2019 #Thread
From the familiar golu in TN to Navaratri fasting concluding with the grand celebrations of Dasami or Dusshera depending on which part of India you're in, the festival is filled with lore, legend and backstories found in Itihasas and Puranas.
#Navratri #Navaratri2019
Some of you may remember that last year during the 9 days of #Navratri, we spoke about 9 kritis of the Navavaranas dedicated to goddess Kamalaamba,composed by Muthuswami Dikshithar. Here’s the thread if you’d like to jog through it. #Navaratri2019
Read 157 tweets
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H.Kartik Arun
@HKA_2017
1/n
 #Solar #renewableenergy #ClimateChange
"I want to install a simple solar PV system in the rooftop of my house. How do I go about it??"

This is the procedure for a simple system with Net-metering and no Batteries.
Step 1: calculate rooftop area in Sqft or Sqm Say 100 sqm++
2/n
 of shadow free area. You need to own the rooftop.
Thumb rule: 1kW needs 10 Sqm/100Sqft
In our case, we can build 10 kW. You need own the rooftop.
Step 2: Check Ebill: say the consumption is 1500 units (kWh)/month. In India, peak sunshine hours = 5.5 hours. In order to++
3/n
 zero your ebill, you need 1500/(30 x 5.5) = 9 kW system.
Step 3: Check sanction load in ebill. You solar size cannot exceed this value.Say sanction load = 10 kW
Step 4: Choose the min of the values in 1, 2 and 3 and that is the size of the system. In this case,it is 9 kW++
Read 9 tweets
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Hubble
@NASAHubble
So, you heard yesterday that Hubble detected water vapor signatures in the atmosphere of a planet beyond our solar system that resides in the "habitable zone." What does all this mean? Follow along as Senior Project Scientist Dr. Jennifer Wiseman answers some questions. #Thread
How can we determine this planet's atmosphere from so far away and why is this discovery exciting?
Does this finding mean we've discovered life on other planets?
Read 8 tweets
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Simwal
@Simwal
#Thread
SALAT TIMES AND THE MOVEMENT OF THE SUN
The five daily prayers are an integral part of a Muslim’s life. In order to fulfill our religious obligation, it is important for all Muslims to
know the timings of all the daily prayers.
Praying Fajr, Zuhr and Maghrib prayers in the right time is not a problem in Nigeria, Asr & Isha are the two prayers that are mostly prayed before time in certain periods of the year.Zuhr & Maghrib are prayed on time because the times of “noon” and “sunset” are well defined.
The difficulty arises in determining the time for fajr (dawn) prayer. How do we define fajr in a scientific way? Moreover, how can we explain the difference between “false” dawn and
“true” dawn? I ll try to explains
how to determine Zawal (solar noon),
Read 36 tweets
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Eppur si muove
@razor0fOccam
katildim katilacagim. uzaya cikmak abartilacak bir sey mi? simdi uzay dedigimiz seyin oyle pek buyutulecek bi tarafi yok. neden? cunku uzay yeterince buyuk. bir de kendi kendini buyutuyor zaten
(bkz: hubble sphere) #Thread icin izninizi isteyeyim. linc etmeden dinleyin bir.
ovunmek gibi olmasin ama uzay, uc asagi bes yukari 150 km irtifada basliyor. ne demek bu?
ankara’da yasayan birisi icin en yakin sahil, uzaydan daha uzak :’( -ozur dilerim-
burada kasit, “asaligik -alcak!- dunya yorungesi” (low earth orbit)
roketler, enerjilerinin az bir miktarini “o mesafeye cikmak” icin kullanir. problem; orada kalmak :D
yani aslinda dogru kritik soyle olmali: adamlar yorungede kaliyor, biz hala oyle boyle soyle☝️
low earth orbitte yer cekimi hala yuzeydeki ivmenin %90’i gibi.
Read 8 tweets

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