Can we all admit that these are just mathematical place holders for: We need this mass/energy to make our equations match observations consistently and accurately, but have no idea what (or where) it is.
I propose fractioal gravity shared between a finite number of co-spatial parallel universes which only interact with ours via gravity. Any ideas?
If sound travelled through the vacuum of space, would we hear the sun from Earth? If so, how loud would it be and what would it sound like?
I’m confused about the symmetry in the Twin Paradox.
If I travel at 0.87c (\gamma=2), I see Earth’s clock running at half-speed. This is true for both the outbound and the inbound leg of the trip.
If Earth's clock is running slow from my perspective during the entire journey (out and back), how is it possible that Earth is 20 years older when I return, while I’ve only aged 10?
Does Earth’s time "jump forward" during my turnaround? And if motion is relative, why doesn't this "jump" happen for me from Earth's perspective? Is it purely because I'm the one undergoing acceleration?
Or is there any video that explains this in an easy manner?
Ok... Im currently in an astronomy class, and there's a couple of question in a lab that I dont understand/ know how to do if I were to post those questions would some of you be able to help me out? Thanks in advance
edit: here are some of the questions im stuck on
question 12:
The program(stellarium) now must be set for the proper latitude. The latitude of Sacramento is 38.5^(o)N, so the altitude of the celestial pole must be set at 38.5^(o). Be sure that the north celestial pole is located above the north cardinal point (that is, make sure the NCP is closer to the north cardinal point than the south cardinal point).
| Object | Rising Azimuth | Meridian Altitude |
|---|---|---|
| Deneb | answer choices ["30°", "35°", "65°", "105°"] | answer choices ["21°", "70°", "83°", "87°"] |
| Arcturus | answer choices ["30°", "35°", "65°", "105°"] | answer choices ["21°", "70°", "83°", "87°"] |
| Fomalhaut | answer choices ["30°", "35°", "65°", "105°"] | answer choices ["21°", "70°", "83°", "87°"] |
| M31 | answer choices ["30°", "35°", "65°", "105°"] | answer choices ["21°", "70°", "83°", "87°"] |
| Meridian Azimuth | Setting Azimuth |
|---|---|
| answer choices "0°", "180°" | answer choices "225°", "285°", "325°", "330°" |
| answer choices "0°", "180°" | answer choices "225°", "285°", "325°", "330°" |
| answer choices "0°", "180°" | answer choices "225°", "285°", "325°", "330°" |
| answer choices "0°", "180°"] | answer choices "225°", "285°", "325°", "330°" |
question 13:
The program(stellarium) now must be set for the proper latitude. The latitude of FLC (Folsom lake college, Sacramento works too)is 38.5^(o)N, so the altitude of the celestial pole must be set at 38.5^(o). Be sure that the north celestial pole is located above the north cardinal point (that is, make sure the NCP is closer to the north cardinal point than the south cardinal point).
When Sirius is observed rising, what is the altitude and azimuth of (α) alpha Aquila? (use whole degrees)
Altitude __ ^(o)
Azimuth __ ^(o)
question 16:
The program now must be set for the proper latitude. The latitude of FLC is 38.5^(o)N, so the altitude of the celestial pole must be set at 38.5^(o). Be sure that the north celestial pole is located above the north cardinal point (that is, make sure the NCP is closer to the north cardinal point than the south cardinal point).
Sidereal time is defined as the right ascension of an object that is on the celestial meridian. When the following stars are on the celestial meridian determine the proper sidereal time.
| Object | Sidereal Time |
|---|---|
| Vega | answer choices ["4h 37m", "5h 35m", "10h 8m", "18h 36m"] |
| Aldebaran | answer choices ["4h 37m", "5h 35m", "10h 8m", "18h 36m"] |
| Regulus | answer choices ["4h 37m", "5h 35m", "10h 8m", "18h 36m"] |
| M42 | answer choices["4h 37m", "5h 35m", "10h 8m", "18h 36m"] |
question 18:
The program now must be set for the proper latitude. The latitude of FLC is 38.5^(o)N, so the altitude of the celestial pole must be set at 38.5^(o). Be sure that the north celestial pole is located above the north cardinal point (that is, make sure the NCP is closer to the north cardinal point than the south cardinal point).
The star (β) beta Aries is to be observed when the sidereal time is 21^(h) 30^(m). Determine the following for this star.
Right Ascension [ Select ] ["1h 55m", "3h 45m", "12h 25m"]
Declination [ Select ] ["5°", "+15°", "+20°"]
Altitude [ Select ] ["12°", "31°", "56°"]
Azimuth [ Select ] ["45°", "87°", "236°"]
​
i also wanna know if you guys know any websites or something so i can really dive deep into it because i wanna learn more
How closely do geostationary satellites generally come to the ideal orbit?
How many meters above or below the ideal orbit are they? How fast do they drift relative to a perfectly 'stationary' satellite?
Why can’t we explore outside of our solar system. I feel like we could launch a satellite but also launch hubs into space so the connection is chained throughout space making it possible to have much longer connections
I understand why. but why can we not go into the atmosphere at a slower speed. even with the space shuttle missions we still required a heat shield. why could we not just fly down slowly to avoid the risk with falling into the atmosphere. like a slow controlled glide/flight back down to earth. wouldn't it be safer.
this would significantly help us with space travel. we can build ships with comfort because we don't need to fall back through the atmosphere. ships could be bigger. and able to make longer journeys in space. I understand money. but it would save money in the long run
Lets say that they are advanced enough to be able to come to earth mostly undetected like they are in those types of movies. And would it be just their technology and spaceship that does it or could it be the aliens themselves? I feel like if they are able to even just move their ship the way they do in movies good chance can mess with magnets and/or electronics right? Or would that be like a completely seperate kind of thing?
Sorry if wrong subreddit for this couldn’t think of a better one to ask in
i watched interstellar and really liked it but i can’t find any other movies to watch that draw me in like that did
really into the scenic views of space or what space may look like and interstellar provided a lot of that
i tried to watch the another movie called the arrival, but could not and did not get into it
i’m also into history so if there’s any space / nasa type documentaries or any films that’d be cool
let me know if you have any suggestions!
I have always had fascination with the Voyager program, more for its humanity outreach for more beyond itself. I am saddened by Voyager 1 losing contact. We have reached out but at this point with a phantom arm.
My curiosity is why we didn't send a following object as a relay for communication back to earth.
So I'm 19 and I've been thinking on what I want my career to be a lot and I love space more than anything I would love to have a space related career I've been trying to research it but I'm not sure what exactly I might need I live in Canada. If anyone can give me some suggestions or advice it would be greatly appreciated!
Edit: Im meaning something where I would be directly researching either technology for space travel, traveling myself, or researching space materials that have been brought back or fallen to earth that kind of thing