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Sergiy Lenzion
  • Member for 2 years, 9 months
  • Last seen this week
  • Australia
22 votes

What did the Apollo missions do with old LiOH canisters & the water they produced?

19 votes
Accepted

Did the Apollo missions fly "over the top" of the Van Allen radiation belts?

16 votes

What happens differently when ISS is inside this red boundary (Russia & Europe & ...)?

16 votes

Apollo altitude vs rate-of-descent schedule

15 votes

How did the USSR track Gagarin's Vostok-1 orbital flight? Was tracking capability an issue in the choice of orbit?

15 votes
Accepted

What did walking on lunar regolith feel like?

15 votes

How does a soft landing technically work without air on the moon?

15 votes
Accepted

Are Zond 2 and Venera 4 basically the same spacecraft design? What were the differences?

13 votes

What is the largest piece of space debris volumetrically?

10 votes

How did the Vostok ejection seat safely eject an astronaut from a sealed space capsule?

7 votes
Accepted

Who was the first to successfully implement on practice ablative heat shield?

7 votes
Accepted

What would be the challenges for a 50 km long tether to the surface of Venus to get recurrent surface samples there?

6 votes
Accepted

What kept Vostok/Voskhod from tipping or rolling upon landing?

6 votes

What is the sensor used for Soyuz booster separation?

6 votes
Accepted

Do astronauts develop the ability to regularly place an object at rest inside the ISS after extended periods in microgravity?

6 votes
Accepted

How much could "sublimator operation" have possibly contributed to Apollo 11's "sizable downrange miss"?

6 votes
Accepted

Why did Sputnik-1 transmit on both 20 and 40 MHz?

6 votes
Accepted

Exactly how does one lope on the Moon?

5 votes

Why were the Sputniks launched to such high apogee?

5 votes
Accepted

How was the S-IVB stage configured for the post-extraction retrograde dump?

5 votes
Accepted

What was the first rocket with de Laval (convergent-divergent) nozzle to fly?

5 votes

Is the Nudelman-Rikhter gun installed on Zvezda module?

5 votes
Accepted

Why did the Apollo 15 LM violently shake & raise dust after the contact probes touched the lunar surface?

5 votes
Accepted

How do Russians enumerate old Soviet space missions?

5 votes
Accepted

Spacecraft remaining at station-keeping with respect to the ISS

5 votes

How often is duct tape used during crewed space missions?

4 votes

Has alcohol ever been consumed in space?

4 votes
Accepted

How was the Vostok capsule stabilized for spin during descent, after the equipment/maneuvering module had detached?

4 votes

First actions taken after identifying a potentially catastrophic decompression?

4 votes
Accepted

Loose items in Apollo CM during reentry?