I have been looking at the unanswered questions on this site for some time (for some days tbh) and in my opinion, most of them are very intriguing and interesting and they deserved to get answered. There are interesting comments beneath the questions but there is no answers or even a partial answer. Some users might comment after some months or years to give some new updates like new findings or some new information but nobody are aware of that because OPs are inactive and they do not edit the question and so they doesn't get bumped on the main page. Eventually, the question gets cold and gets accumulated in the unanswered tab.

I do not have sufficient knowledge and lack expertise in this field but I would like some of these interesting question to get answered. I do not have enough reputation to give bounties on these question. Also, these question are already well-formatted so there is no room for editing (and thus do not get bumped on the main page).

Some honorable mentions:

  • "SE - stop firing the good guys" is doing a commendable job in answering some old questions in the space exploration site (you can check his activity).

  • "uhoh" is a master in commenting and linking questions and stuffs (he has a habit of linking unanswered question and giving some attention). He too asks good questions.

  • "usernumber" also ask some good question, some of his question are left unanswered.

So, I would like some highly knowledgeable users here to make an effort in answering and giving some light to these questions. Note that I am not forcing anyone. Anyone who has or give a certain interest in some question might give a try, or do some edit or give some bounty and thus attract attention.

I do realize that all questions can't be answered so, I don't expect all of them to get answered but I am sure some of them will get very good answers.

  • 6
    $\begingroup$ I think you're right. We're going through a big growth spurt right now, and maybe with the new activity we can get some folks to take a fresh look at older questions. Perhaps select a few of your favorites and link them in an answer below. You could make it a community wiki so others can contribute. Everyone can use that as a starting point for taking a look at old stuff. $\endgroup$
    – called2voyage Mod
    Oct 8, 2020 at 18:26
  • 2
    $\begingroup$ Just in case other users haven't noticed, Stack Exchange has "unanswered" questions filter if they want to easily browse questions that are considered unanswered by Stack Exchange (no upvoted/accepted answers, contrast to "no answer"). $\endgroup$
    – Andrew T.
    Oct 13, 2020 at 5:21

2 Answers 2


Update VI [24-06-2021] (See previous updates)

As per called2voyage's advice, I am linking some questions here. Let's start with five questions. I will be updating this list on a weekly basis (or as per requirement). I am also making this answer community wiki so that others can contribute. Happy answering.

There was a big gap between the updates. So, this is a BIG update with 20 questions. I won't be updating this list any time soon.

Note: Most of these question has valuable comments beneath it which can be compiled to answers.

  1. What fraction of a star's hydrogen store will be fused over its lifespan?
  2. How far away was the binary black hole that produced GW170729?
  3. https://astronomy.stackexchange.com/questions/27113/what-is-the-highest-resolution-image-of-the-moon-taken-from-earths-surface
  4. Could there be liquid water on Uranus? Are there any indications that there might be?
  5. Black spot in Mars' sky
  6. Extraterrestrial snow?
  7. How long would it take to first detect a new object in the night sky given its apparent magnitude?
  8. How to calculate the temperature of an exoplanet?
  9. How was the axial tilt of planets measured?
  10. Did simultaneous transits of Mercury and Venus actually last occur in 373,173 BC?
  11. Have auroras on Titan been observed yet?
  12. Are there any bodies in the solar system whose rotation is almost tidally locked or barely tidally locked?
  13. What if there was an asteroid belt with the mass of a planet?
  14. How much more mass would Mars need to currently have enough pressure for liquid water and oxygen?
  15. https://astronomy.stackexchange.com/questions/41366/did-the-moon-have-a-substantial-atmosphere-in-the-past
  16. New method for exoplanet detection based on iridescence?
  17. Uranium accumulating inside a White Dwarf?
  18. What are the typical emissions of Jupiter's Aurorae?
  19. Sun (star) spots (size)
  20. Gravity on Mercury's highest elevation?

Questions answered till now:

  1. Why was helium hydride (HeH+) the universe's first molecule? (answered by @Rob Jeffries)
  2. What are Kepler's laws (as he wrote them)? (answered by @Connor Garcia)
  3. How does the gravitation of Jupiter or other big planets affect Kepler's third law? (answered by @Connor Garcia)
  4. What is the farthest reported distance from observer from which a solar system body has occulted a star? (answered by me)
  5. Is 486958 Arrokoth (2014 MU69 aka Ultima Thule) the only solar-system object determined to be binary by occultation? (answered by @ConnorGarcia)
  6. Do Enceladus' geysers fall back to its surface or do they achieve escape velocity? (answered by @Connor Garcia)
  7. How fast was the Earth spinning directly after the Moon formed? (answered by @Connor Garcia)
  8. What is happening with these solar particles detected near the Sun that is so newsworthy? (answered by @B--rian)
  9. How active was the Milky Way in its first 5 billion years? (answered by @B--rian)
  10. How does Io's atmosphere behave locally near volcanic plumes? (answered by @B--rian)
  11. Assuming no light pollution, was "2C. 1406" ever visible to the naked eye? (answered by @HDE 226868)
  12. What are the 4 candidates for Planet Nine reported in 2017? (answered by @B--rian)
  13. Did the Moon have a substantial atmosphere in the past? (answered by me)
  14. What is the highest resolution image of the moon taken from Earth's surface? (answered by me)
  • $\begingroup$ Isn't this list already captured by the Revival badge astronomy.stackexchange.com/help/badges/64/revival ? Or are you just featuring questions from your weekly list of five here? $\endgroup$
    – Connor Garcia Mod
    Dec 2, 2020 at 20:34
  • 2
    $\begingroup$ @ConnorGarcia No, these questions were from my list of five. The two questions you answered were previously mentioned and were replaced with new one. $\endgroup$ Dec 3, 2020 at 2:36
  • 3
    $\begingroup$ Great, I really appreciate this meta post! I read it when I first joined and it inspires me to try to answer old questions! $\endgroup$
    – Connor Garcia Mod
    Dec 3, 2020 at 2:40

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