The Earth has a mass of 6*10^24 kg. How did scientists figure that one out? |
- The Earth has a mass of 6*10^24 kg. How did scientists figure that one out?
- Coronaviruses usually just cause the common cold ,why is Covid-19 different? Can covid-19 also just cause mild upper respiratory tract illness like the common cold in some people?
- How do deep space probes communicate with Earth?
- Can someone explain how an Exit Poll can work when there is so much mail-in and early voting?
- Can COVID-19 reproduce using hand cells?
- How do space probes make it past the astroid belt without crashing into them?
- How do octopuses, squid and cuttlefish match their pigment to the surrounding environment?
- Semiology, Whats the difference between passive articulatory limitation and active articulatory limitation ?
- What exactly about electron degeneracy pressure stops a white dwarf from collapsing?
- Considering that the earth is a few billion years old, how are elements with a half-life of a few million years naturally found?
- Why do Mushrooms grow when it's humid outside? How Do spores spread though the air? Is "wet" are beneficial?
- Animals camouflage by mimicking their environment, but that’s in our visible spectrum. Does camouflage of certain creatures extend outside of our visible spectrum, and if so, how far?
- Does the reversal potential of a voltage gated ion channel change during activation/deactivation?
- Can you technically graft any plant together?
- How does artificial light at night impact sleep quality and sleep duration?
- Do seeds carry more nutritional value than their flesh/meat?
- Why do some elements have to be in pairs amd some don't?
- Does this water descaler really work?
| The Earth has a mass of 6*10^24 kg. How did scientists figure that one out? Posted: 01 Nov 2020 08:09 PM PST |
| Posted: 02 Nov 2020 04:26 AM PST |
| How do deep space probes communicate with Earth? Posted: 02 Nov 2020 06:58 AM PST This one has been boggling me for a long time now. Let's say that a distant probe like Voyager 1 tries to communicate with earth. As per this page Voyager 1 is roughly 141 Astronomical Units away from earth which translates to roughly 19 light hours. AFAIK Voyager 1 needs to point it's antenna directly to Earth to communicate, so it locates Earth and sends a message. Since light speed is finite and it takes 19 hours the message to reach our Deep Space Network, the Earth has moved through space roughly 2 Million Kms. My question is, how is it possible for the radio wave to hit the Earth when it has moved 2 Millions Km? Is it because as the radio wave moves through space time the area it covers increases so it hits the earth because the message was sent to the general direction the earth was 19 hours before? or something in my previous assessments is flawed? [link] [comments]  |
| Can someone explain how an Exit Poll can work when there is so much mail-in and early voting? Posted: 02 Nov 2020 06:21 AM PST |
| Can COVID-19 reproduce using hand cells? Posted: 02 Nov 2020 06:16 AM PST Hello, I know viruses needs cells to reproduce, but can it reproduce in ANY cell type? Or is there specific cells? So can COVID-19 for example, multiply using skin cells? And if so, can it keep multiplying using your skin cells, then your muscle cells, all the way til it reaches your blood vessels? Thank you for any help! [link] [comments]  |
| How do space probes make it past the astroid belt without crashing into them? Posted: 01 Nov 2020 04:24 PM PST I am a huge fan of space and learning about it and I have always wondered how we don't hear of probes constantly crashing into the astroid belt. I know space is huge and have heard things like space is too big so we don't have to worry about it, but I was wondering if there was a more direct reason. I am sure the technology we have now helps plot the course but I have always been curious. [link] [comments]  |
| How do octopuses, squid and cuttlefish match their pigment to the surrounding environment? Posted: 01 Nov 2020 02:34 PM PST I understand that the expansion and contraction of pigment cells is how these animals achieve color change, but is this a passive trait or do these animals consciously control it? For instance, will an octopus see the pattern and color of a specific rock and consciously "match" this pattern? Or do they have predetermined patterns and effects that have evolved to mimic the surrounding environment? [link] [comments]  |
| Posted: 02 Nov 2020 04:37 AM PST |
| What exactly about electron degeneracy pressure stops a white dwarf from collapsing? Posted: 02 Nov 2020 06:24 AM PST So I know that the Pauli exclusion principle stops identical fermions from occupying the same state, but I don't understand intuitively why this stops the collapse. Does it create a real world force, similar to the resistance of "I can't put a peg in this hole because there's already a peg there, so Newton's 3rd law puts sends any force I put in to forcing the peg in back to me", or is it something else entirely? Is there no intuitive analogue and you just have to accept the quantum mechanics for what it is? [link] [comments]  |
| Posted: 02 Nov 2020 02:30 AM PST Logically wouldn't they all decay down to their most stable forms considering how long the planet has been around since most of them were created in the early solar system? [link] [comments]  |
| Posted: 02 Nov 2020 06:05 AM PST |
| Posted: 01 Nov 2020 06:48 PM PST Follow up, are there camouflaged creatures that we don't perceive as such, but are fully camouflaged in ultraviolet or infrared or even further? [link] [comments]  |
| Does the reversal potential of a voltage gated ion channel change during activation/deactivation? Posted: 02 Nov 2020 04:31 AM PST As far as I understand it, the reversal potential is the transmembrane potential at which there is no net movement of ions across the cell membrane. It is dependent on the molar concentration of the ion in question inside and outside of the cell membrane (as well as temperature etc.). The difference between the membrane potential and the reversal potential is the driving force for any ion movement across the membrane. Here is my question: When the ion channel (let's say a K+ channel) opens, the K+ ions move out of the cell, thus shifting the relationship of ion concentration outside to concentration inside... doesn't that mean that the reversal potential is now different than it was in the closed state (assuming we only have K+ channels in the cell)? [link] [comments]  |
| Can you technically graft any plant together? Posted: 01 Nov 2020 07:30 PM PST Grafting is the process of combining two plants but it just might not be successful? Or does saying that you grafted two plants imply it was successful? [link] [comments]  |
| How does artificial light at night impact sleep quality and sleep duration? Posted: 01 Nov 2020 05:11 PM PST So many people have told me that keeping the lights on (or having a night light on) prevents people getting good sleep and causes people to sleep less than an individual who sleeps with all the lights off. Can someone explain this and also recommend some journal articles to read? I'd appreciate that very much. [link] [comments]  |
| Do seeds carry more nutritional value than their flesh/meat? Posted: 01 Nov 2020 04:37 PM PST Let me clarify that I have no idea what to call the edible parts of a fruit like orange or watermelon therefore I'm referring to it as flesh/meat. As for the question. I am wondering if seeds in fruits carry more nutritional value than their flesh. Someone I know told me that grape seeds carry more vitamins and phytonutrients, therefore it was better to get grapes with seeds and eat the whole thing rather than get seedless grapes. So is this true. And if it is, does this also happens in others fruits/berries ? [link] [comments]  |
| Why do some elements have to be in pairs amd some don't? Posted: 01 Nov 2020 04:28 PM PST I know that the 7 elements of Br, I, N, Cl, H, O and F alsways have to be in pairs, and I also know that it is because they do not have 8 elektrons in the outer layer making them unstable if they don't have a shared electron with another atom. My is question is why do all the other elements (with the exception of He, Ne, Xe, Kr, Ar, Ra) not have the same problem seeing as how they do not have 8 in the outer layer either. (Please tell me if something is unclear about my question) [link] [comments]  |
| Does this water descaler really work? Posted: 01 Nov 2020 07:01 AM PST I see this thing on tv in my country all the damn time. But does the chemistry/physics behind this product really work? [link] [comments]  |
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