Questions tagged [water]

Questions about the water molecule (composed of two atoms of hydrodgen and one atom of oxygen) and its detection in celestial objects.

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When did the first liquid water settle on planets? [closed]

PRELIMINARY Water is necessary for supporting "life", at least the particular form of life as we know. The origin of Earth's water is still debated, but there are clues that most of it was ...
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Is it safe to look at an annular eclipse during sunrise using a medium

will looking at annular eclipse reflection through a bowl of water damage your sight? i already tried viewing it reflection through a bowl of water.
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Cause of complicated water vapor emission lines in red supergiants?

Why do some water vapor emission lines in red supergiants have a complicated structure with lower peaks to the left and to the right of the peak at the central frequency? It has something to do with ...
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Could a heavy exoplanet squeeze water into being liquid and 4° warm?

Let's say there is an exoplanet orbiting its host star well outside its habitable zone. Suppose further that it has a lot of water, being perhaps comparable to earth when it comes to the volume ratio ...
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Could there be liquid water on Uranus? Are there any indications that there might be?

Like most planets, Uranus has a very cold outer atmosphere and a very hot core. What we see is a very thick primary atmosphere with plenty of hydrogen. Deeper in, we might suppose that water ...
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What happens to Europa's (or another ice moon's) water if we drilled a hole through the ice crust down to the ocean?

Suppose we drilled a 1 ft (30 cm) diameter hole through Europa's ice crust. As Europa doesn't have an atmosphere, the water would obviously either sublime (turn to vapor) or instantly freeze once a ...
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How much more mass would Mars need to currently have enough pressure for liquid water and oxygen?

My question is whether Mars just about failed to meet the threshold or missed it by a lot. It's been dry for 3 billion years. How much bigger would it have needed to be to buy it that extra time? Let'...
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Could liquid water have existed in open space 15 million years after the Big Bang?

Around 15 million years after the Big Bang, the ambient temperatures was about $24^\circ {\rm C}$, which is in a range where water could be liquid. Could liquid blobs of water be existent then? PS: I ...
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Can a habitable planet be smaller than 0.58 Earth radii?

According to the below image, the lowest escape velocity a planet can have in order to still be able to retain water on its surface and have a temperature above freezing is 6.5 km/s minimum. With ...
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Is the water underneath Europa's ice cap potable?

I read this question on Worldbuilding.SE, and figured that the astronomy site would have answers too, particularly for the specific example of Europa. The idea is that Earth's oceans are salty because ...
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Are ocean water planets at Mars' atmospheric pressure possible?

Can water planets exist whose atmospheric pressure at sea level is just above the triple point of water, say at about 690 Pa (0.1 psi)? If no, why not? Just curious. How thick or thin can atmospheres ...
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An influx of water on Venus

What if a moon like triton or a frozen extraterrestrial body containing lots of frozen ice were set on a collision course with Venus. Would an inlfux of huge amounts of H2O precipitate a possible ...
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If water vapor is always blown away into space, how is it able to create chemical compounds on Venus?

This is the follow-up of this chem.SE question. According to Wikipedia, water vapor on Venus is present in trace amount (20 ppm). There are multiple reasons why Venus has very low water content: The ...
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What are the most recent minerals modified by water found to date on Mars?

There likely was quite a bit of liquid water on the surface of Mars less than 4 billion years ago. We know this because we found rocks that old that have been modified by the presence of water. For ...
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How old are the Martian blueberries?

The martian blueberries (only blue in false color) found by the Opportunity rover in Meridium Planis are formed by slow evaporation in mineral-rich liquid water. They obviously formed early in the ...
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Why wouldn't massive torrents freeze on Mars?

I am currently reading the Cambridge Guide to the Solar System. In chapter 8, section 8.7, they explain that massive torrents of water created outflow channels on the surface of Mars in the past. The ...
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Ice filled craters on Mars

How many craters on Mars have ice in them and which ones have permanent ice? I could only find Korolev and the unnamed one - strange for such a remarkable crater. http://www.esa.int/...
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Would Europa be an ocean planet if it were in the habitable zone?

If a Europa-like body were in the Sun's habitable zone, let's say in an orbit between Earth and Mars, would the body become and remain a water ocean planet? In the habitable zone, the Sun would warm ...
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How do we know that comets definitely mase and not just fluoresce? What is it about 18-cm lines that indicates that is really masing per se?

Wikipedia's Astrophysical_maser#; comets mentions some anecdotes of notable masers associated with comets, and Maser emissions from comets begins: The 18-cm lines of the OH radical are the only ...
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Underground sea in Titan(Saturn's moon), water or hydrocarbons?

Is the underground sea on Titan formed of water or hydrocarbons. Is anyone certain? I have read a lot of various documents from NASA and Cassini missions and Huygens missions, and I have become ...
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How long could an ocean last in space?

If all of Earth's oceans were suddenly moved into outer space, how long would it take for them to evaporate? My understanding is that water evaporates straight away in space... but what about when it'...
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Can fish and other sea creatures survive in watery planets like Neptune or any other planets that has water?

I'm a bit curious since Neptune does not have a land surface and it is covered with water, I mean water has oxygen right? What will happen if we put some sea creatures in these watery planets? Can ...
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How would water-ammonia oceans behave?

Scientists strongly suspect that several moons in our solar system have frozen-over oceans of water-ammonia mixture. I've also read speculations on the possibility of surface water-ammonia oceans on ...
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Water vapour in space

This question is inspired by, but different from, What happens if an ice cube is left in space? Mark's accepted answer says "…if you stick your ice cube out in the Oort Cloud, it'll grow: the mean ...
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What constraints are there on solid material in the ice giants?

Recently there has been experimental verification of superionic water ice (suggested to be called ice XVIII, not sure if this nomenclature is official yet), which turns out to be a solid (or at ...
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How did Arecibo make radar images of ice on Mercury's poles?

update: I still haven't been able to get my hands on the Icarus paper linked below (I'll try other libraries) but these are newer and quite interesting!: Constraining the thickness of polar ice ...
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How to calculate the thickness of the ice crust on a frozen ocean planet/moon?

How do I calculate the thickness of the upper ice layer on cold ocean worlds like Europa, Enceladus, Ganymede, ...? I'm asking this for a programm I'm currently writing. Given/Known is: mass, radius, ...
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Does Mars' "Northern ocean" have another name? What about the "Inland Sea"?

The March 15, 2019 Phys.org article A NASA spacecraft may have explored the edges of an early Mars sea in 1997 shows a stylized map of an area on Mars where the Mars Pathfinder landed and uses colors ...
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Is the water on Mars drinkable? [closed]

Could water from Mars be fresh enough to drink? Could one run the water through a home water filter? I understand when water is frozen the salt is ejected as brine so would newly formed snow or ice be ...
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Any information on the salt content of Mars' atmospheric dust?

Answers to and comments on How to drink water on Mars? suggest that one would not want to drink melted water ice obtained from exposed surface deposits near the poles because it may contain various ...
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Would drinking melted ice water from Mars taste like sparkling water?

Does water on Mars form from the atmosphere as ice free from salt? Does water desalinize through the evaporation and transpiration? When the fresh top ice is placed in a container then pressurized to ...
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Help understanding the false MRO observations of hydrated minerals on Mars

The Science News article An orbiter glitch may mean some signs of liquid water on Mars aren’t real begins: Some signs of water on Mars may have just dried up. Thanks to the way data from NASA’s Mars ...
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How long will a ball of ice stay in orbit around Earth? [closed]

How big would a ball of frozen water need to be to last one orbit? How would atmospheric drag effect the ball of water? https://space.stackexchange.com/questions/32188/what-is-the-darkest-orbit-...
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Water Content of Space Bodies

In general, are carbonaceous chondrites (CC) or comets more water rich? I know that evidence has suggested that both CC and comets are partly composed of water, but which body is generally more water ...
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Water Ice on Meteorites

I was reading an article by David O'Brien et al. where it stated "in meteorites only the water bound to the silicates can be found, all the water ice having been lost, whereas on asteroids water ...
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What would happen if we released water into deep space?

If we went to deep space by a spacecraft and released water into space, what would happen? Would the water freeze to ice or would it remain as a liquid?
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Can Liquid Water exist on Mars?

Outside of a specially crafts environment, could liquid water exist on Mars? Not some time in the distant past, but within the last few years. Mars' atmosphere is too thin for water to exist, right? ...
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How was water formed?

We know that a planet is formed from the nebula of gas and dust. Gravity pulls the particles together in a core. So we all know that the gas cloud is a cloud of hydrogen. But how did water form? ...
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How can artificial gravity hold the water in swimming pool? [closed]

I was watching Passengers (2016). In this movie, a swimming pool exists in the space station. In middle of the movie, Artificial Gravity is turned off and the water rises, with the swimmer suffocating ...
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Enceladus; why use the words "geysers", "jets", and "plumes" interchangeably?

Background, Europa: In an earlier question How can “Geysers” on Europa reach heights of 100km? I brought up the use of the word "geyser" in association with the reported confirming observations of ...
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Can a planet with a hydrogen atmosphere have a water ocean with dissolved oxygen? [closed]

Reading up on rogue planets (i. e. planets not orbiting a star), it turns out that a rogue Super-Earth with a sufficiently dense hydrogen atmosphere could retain its internal heat and have oceans/...
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How can "Geysers" on Europa reach heights of 100km?

After seeing today's Washington Post's article NASA just saw Europa’s geysers erupting into space. Again., and especially the phrase "geysers erupting into space" I checked and Europa has a surface ...
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Can a comet orbit a planet?

Given that moons commonly orbit planets, why do we never encounter a comet orbiting a planet? What would happen (exactly, in detail) if a large one did settle into a stable orbit around the Earth? ...
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Does liquid water on Mars means life?

We need to figure if liquid water is present throughout a Mars year, and how long the planet has been at its current distance from Sun. That will give us the length of time that liquid water has been ...
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Is liquid water on Mars such a big leap compared with ice?

I thought we have found bacteria or other kinds of life on Mars. Now it is liquid water. Is there such a big difference between liquid water and iced water?
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How easy is it to mine water on Ceres?

It has been suggested by some futuristic or sci fi leaning thinkers, that Ceres' surface might be mined for water to support human exploration and settlement of space. But NASA's Dawn mission and ...
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Do NEA (Near Earth Asteroids) have minable water ice?

Water is very useful for rocket fuel and life support in space. But does water, in abundance and form which conceivably could be usefully mined this century, really exist in NEA's? Or do we have to go ...
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How did water get on Earth

I recently read that water more than likely got here by comets (carrying water) hitting the Earth. However it also it says the impact of a comet hitting the Earth is much greater than an atomic bomb. ...
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Meteorites bring water

The latest information suggests that Earth's water came from Meteorites . The Moon was also bombarded by Meteorites and yet it has no water. Is this because it lacks an atmosphere and its water was ...
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Do/did the asteroids contain enough water to create Earth's oceans?

It seems from the recent Science paper by Altwegg et al (2014) that the commonly accepted source of Earth's water being the comets might not be (completely) true. Their study suggest that the water in ...