Was Venus ever within the habitable zone of our Sun? |
- Was Venus ever within the habitable zone of our Sun?
- Supernova explosions are caused by the star's matter collapsing in on itself and then bouncing back out. This matter moves beyond the initial radius of the star. Where does this energy come from that allows this star matter to travel out into the universe?
- How does drano unclog drains?
- If space is ever so expanding, do we seen new/farther everyday we take photos of the outer edges of space? Do we add on to “observable universe” everyday too?
- I'm reading about the electrical system of a dual engine aircraft. It says that the maximum load for single generator operation is 400 amps up until 32,500 feet. Then the max is 280 (the max load with dual generators working). Why does altitude matter in the electrical system?
- If the temperature of a gas reaches absolute zero, what would happen to the volume, rather, what would the volume be?
- Why does paraffin wax, as a solid, float in water, but sink when in a lava lamp?
- What is so terrible about pulling out your flash drive too soon?
- How does cell phone use in classrooms change the class average grades?
- When medicines say "take with food", what happens at the biological level that changes the way the medicine interacts with you?
- How did we determine dogs were colorblind?
- Can you explain, to the layperson, how the Universe is Flat?
- What's the smallest fusion reactor possible?
- What causes some planets to have an atmosphere?
- If cherenkov radiation were to occur in air, would the light be in the visible spectrum? If so, what colour would be produced?
- Is there dark matter all around us or just in space?
- How does radiation cause cancer?
- What is the most widely accepted theory on why Uranus is so much colder than Neptune?
- What is happening neurologically when someone passes out from too much alcohol intake?
| Was Venus ever within the habitable zone of our Sun? Posted: 28 Jan 2019 10:45 PM PST It is a known fact that main sequence stars increase their luminosity over time, as helium accumulates in their cores. Even though our own sun will be around for ~5 billion more years, it will have gotten bright enough 500 million years from now to have boiled away our oceans. So what if we turn back the clock? Was there a time, say, 3 billion years ago, when the current orbit of Venus would've been within the habitable zone? Would it have been in the habitable zone at the time (considering how chaotic the early solar system was, it's likely that all of the planets moved at least a little bit, IIRC)? Is it still within the habitable zone now? EDIT: Torn between "astronomy" and "planetary science" flairs. [link] [comments]  |
| Posted: 29 Jan 2019 02:21 AM PST Just like how a ball won't bounce back beyond its original point of release, or how a pendulum will never swing past its original position. Where does this energy come from in the case of the matter that is flung away from dying stars? [link] [comments]  |
| Posted: 28 Jan 2019 04:27 PM PST |
| Posted: 28 Jan 2019 09:12 PM PST |
| Posted: 28 Jan 2019 05:38 PM PST This is in an engine out scenario with only one operating generator. [link] [comments]  |
| Posted: 28 Jan 2019 08:42 PM PST |
| Why does paraffin wax, as a solid, float in water, but sink when in a lava lamp? Posted: 28 Jan 2019 04:40 PM PST |
| What is so terrible about pulling out your flash drive too soon? Posted: 28 Jan 2019 12:15 PM PST |
| How does cell phone use in classrooms change the class average grades? Posted: 28 Jan 2019 06:05 PM PST I know many studies have been done between the correlation between cell phone use while trying to take notes/pay attention in class, but have any studies been done over time? For example, how does the class average of an intro to psychology class today compare to the class average of the same class 10 years ago, when cell phone/laptop use was not prevalent in class ? (and we can assume that students took better notes/were able to retain more information) [link] [comments]  |
| Posted: 28 Jan 2019 12:39 PM PST Also, does the amount of food you eat matter, or does that depend on the medicine? [link] [comments]  |
| How did we determine dogs were colorblind? Posted: 28 Jan 2019 11:05 AM PST |
| Can you explain, to the layperson, how the Universe is Flat? Posted: 28 Jan 2019 06:27 PM PST I was just listening to the latest Joe Rogan podcast featuring Brian Cox. It was an amazing, mind blowing discussion, but I have such a difficult time understanding what it means when an astrophysicist describes the universe as Flat. From my perspective, standing on earth, I can look at the sky north, south, east and west and I believe (perhaps erroneously) that space extends billions of light years in every direction. Same with my buddy on the other side of the world. So I guess in my layman's mind I see space as an object that extends infinitely in three dimensions, which to me doesn't seem flat. Can someone help me understand this concept correctly? [link] [comments]  |
| What's the smallest fusion reactor possible? Posted: 28 Jan 2019 01:28 PM PST I know that we have trouble making energy positive fusion reactors already. That aside, is there a minimum mass one could achieve sustained fusion with, regardless of pressure and temperature? Is this smallest size any different than the smallest theoretical size to achieve energy-positive fusion with? Do different fusion reactor designs have different minimums? [link] [comments]  |
| What causes some planets to have an atmosphere? Posted: 28 Jan 2019 08:19 AM PST This seems like an incredibly stupid question (so stupid that I'd rather ask reddit than check with my professor, lest she think worse of me for it), but I realized the other day that I genuinely don't know why planets have atmospheres. The gas seems like it should move out into the vacuum of space. I'm assuming it's gravity that keeps it from doing that, but I don't really understand how. My understanding of how gravity works is that each object exerts a force proportional to its mass, which makes sense for objects on the earth, but gas has such small, far-apart molecules that move so quickly. And in that case, why do some planets not have an atmosphere, when some do? Is it just based on the planet's size? Or are there other factors to it? [link] [comments]  |
| Posted: 28 Jan 2019 03:36 PM PST |
| Is there dark matter all around us or just in space? Posted: 28 Jan 2019 11:59 AM PST And if it is just in space, why is it there and not here? If it is all around us, is it in the same place as regular ( visible?) matter? Does it inhabit the same place but not the same dimension? [link] [comments]  |
| How does radiation cause cancer? Posted: 28 Jan 2019 02:40 PM PST |
| What is the most widely accepted theory on why Uranus is so much colder than Neptune? Posted: 28 Jan 2019 10:40 AM PST I can assume a large part could be attributed to it's orientation, but is the make up of its atmosphere or a potentially cooler core attributable to this as well? Does it have a unique composition or anything specific that might lead to the cooler temperatures as well? [link] [comments]  |
| What is happening neurologically when someone passes out from too much alcohol intake? Posted: 28 Jan 2019 10:26 AM PST Also, what makes someone exhausted and craving sleep when they've drunk too much? [link] [comments]  |
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