Recent comments in /f/space
SailingNaked t1_j680vmz wrote
Reply to comment by nicuramar in If you could instantaneously place a space telescope at any desired distance (LYs), from any planet/galaxy etc., where would it be and what would you be documenting? And for what purpose? by kennyarsen
That is where OP and you are wrong, and that's their point I wanted to clarify. The words are interchangeable. The Hubble flow has a speed and distance component... (km/s)/Mpc... speed over distance. Rate of expansion is just another expression of the speed of expansion that new space is created.
Edit: to try my hardest to clarify and settle this issue...
The expansion is given as (km/s)/Mpc.
That means that there is a rate over a distance.
If you take (10 km/s)/10 km or (20 km/s)/20 km... they are the same.
When the denominator is bigger the numerator will be bigger.
When the distance is greater the speed will be greater.
They are still the same...
(10 km/s)/10 km = (1 km/s)/1 km
(20 km/s)/20 km = (1 km/s)/1 km
The expansion rate/rate of expansion/speed of expansion are all the same everywhere.
Varsect t1_j680v5y wrote
nicuramar t1_j680kt5 wrote
Reply to comment by SaishDawg in If you could instantaneously place a space telescope at any desired distance (LYs), from any planet/galaxy etc., where would it be and what would you be documenting? And for what purpose? by kennyarsen
> I would say our best candidate for a planet with intelligent life. That’s cheating though since we don’t have one (maybe life, but no signs of intelligence yet).
I was gonna say “earth” until you added the last bit ;)
nicuramar t1_j680j21 wrote
Reply to comment by Varsect in If you could instantaneously place a space telescope at any desired distance (LYs), from any planet/galaxy etc., where would it be and what would you be documenting? And for what purpose? by kennyarsen
Such as magically placing a telescope anywhere?
nicuramar t1_j680i15 wrote
Reply to comment by HilaryClintonsEmails in If you could instantaneously place a space telescope at any desired distance (LYs), from any planet/galaxy etc., where would it be and what would you be documenting? And for what purpose? by kennyarsen
> This location would provide an unparalleled view of the early universe
How? If placed there, it will not observe the light as it was 4.5 billion years ago.
nicuramar t1_j680bws wrote
Reply to comment by Feeling_Percentage_9 in If you could instantaneously place a space telescope at any desired distance (LYs), from any planet/galaxy etc., where would it be and what would you be documenting? And for what purpose? by kennyarsen
What do you mean by natural gravity?
nicuramar t1_j6807ie wrote
Reply to comment by SailingNaked in If you could instantaneously place a space telescope at any desired distance (LYs), from any planet/galaxy etc., where would it be and what would you be documenting? And for what purpose? by kennyarsen
> At any point in space, the Hubble flow is the same. That is why it’s called a constant. It is the same everywhere.
Yeah, but you said “speed of expansion” in the other comment, which doesn’t exist, since it’s a rate ;). Maybe that’s what they meant.
[deleted] t1_j67ydel wrote
EasterBunnyArt t1_j67x6q0 wrote
Reply to comment by Druggedhippo in Earth's inner core may be slowing down, but “Nothing cataclysmic is happening,” says Hrvoje Tkalcic, a geophysicist at Australian National University. “The inner core is now more in sync with the rest of the planet than a decade ago when it was spinning a bit faster.” by clayt6
Ah thank you for the links and the second link might be what I was thinking of.
Interesting reads, even if half of it is a bit beyond my normal comprehension.
Youssef_Makhoul t1_j67tn3x wrote
Reply to What is your favorite exoplanet, and why? by Mister_Moho
GJ 1214b Because it's like a "Hot shower" but on a planetary scale
[deleted] t1_j67sal6 wrote
mdotca t1_j67rp1w wrote
Reply to If you could instantaneously place a space telescope at any desired distance (LYs), from any planet/galaxy etc., where would it be and what would you be documenting? And for what purpose? by kennyarsen
65 million light years from earth. I want to see dinosaurs.
space-ModTeam t1_j67qm2a wrote
Reply to Need Help With Sci-Fi by SlickFire5555
Hello u/SlickFire5555, your submission "Need Help With Sci-Fi" has been removed from r/space because:
- Such questions should be asked in the "All space questions" thread stickied at the top of the sub.
Please read the rules in the sidebar and check r/space for duplicate submissions before posting. If you have any questions about this removal please message the r/space moderators. Thank you.
[deleted] t1_j67mf30 wrote
Reply to comment by greymart039 in Need Help With Sci-Fi by SlickFire5555
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SailingNaked t1_j67mdr0 wrote
Reply to comment by Anonymous-USA in If you could instantaneously place a space telescope at any desired distance (LYs), from any planet/galaxy etc., where would it be and what would you be documenting? And for what purpose? by kennyarsen
At any point in space, the Hubble flow is the same. That is why it's called a constant. It is the same everywhere.
The observation that farther things move away faster is just that - an observation. They aren't so much moving as they are just getting more distant. Every point between the observed object and the observer is expanding at the same rate. It's not expanding faster the farther away the object is... it is just observed to be faster because there is more space expanding in between.
The speed of expansion is the same. Just when you have more space expanding, you move apart faster.
Edit: Maybe I can make the point clearer...
The rate of expansion is the same everywhere.
The observation that the expansion rate is faster the more distant the observed object is just an observation.
The reason we observe it to be faster is because to our eye we see it moving away faster than something close.
The speed of expansion isn't faster for a distant object or a close object.
The more space (distance) there is between an object, the more space there is to expand.
That space expands at the same rate (Hubble flow).
The expansion isn't faster... only the amount of distance increases.
That distance increases proportionally (at the same rate) to the distance between observed and observer.
Loose-Addition-5730 t1_j67m8ta wrote
Reply to comment by swfo in Why are "metals" more effective at cooling molecular clouds than hydrogen and helium? by Thomas_Bonk
Coming from a chemistry background this will take some getting used to.
Anonymous-USA t1_j67lqdf wrote
Reply to comment by SailingNaked in If you could instantaneously place a space telescope at any desired distance (LYs), from any planet/galaxy etc., where would it be and what would you be documenting? And for what purpose? by kennyarsen
The speed of expansion isn’t the same everywhere, it’s 73 kps per megaparsec. The further the distance the faster the expansion (and redshift). And yes, as we both said, that Mpc distance is relative to the observer. And the aforementioned expansion rate is the same for all observers anywhere.
Birblets t1_j67lfqm wrote
Reply to comment by DarthIndifferent in If you could instantaneously place a space telescope at any desired distance (LYs), from any planet/galaxy etc., where would it be and what would you be documenting? And for what purpose? by kennyarsen
i didnt think about this, thatd be so cool to see tbh
SailingNaked t1_j67kxbj wrote
Reply to comment by Mother_Nebula904 in If you could instantaneously place a space telescope at any desired distance (LYs), from any planet/galaxy etc., where would it be and what would you be documenting? And for what purpose? by kennyarsen
You are correct in a way. There is a visible distance limit that we can observe. This is because any light produced beyond that distance will never reach us... ever. Even traveling at the speed of light, the space between the source and the observer expands into a greater distance than the light can travel. It'll constantly head towards us, but it will never reach us. A little photon, lost in the ever expanding emptiness, continuing on to never be observed.
Druggedhippo t1_j67kt1u wrote
Reply to comment by EasterBunnyArt in Earth's inner core may be slowing down, but “Nothing cataclysmic is happening,” says Hrvoje Tkalcic, a geophysicist at Australian National University. “The inner core is now more in sync with the rest of the planet than a decade ago when it was spinning a bit faster.” by clayt6
There is no credible evidence for a total geomagnetic pole reversal during Roman times. The last one was at least 780,000 years ago.
There is however research that talks about localized evolution in the geomagnetic field, for example this one in Iberia
SailingNaked t1_j67k35r wrote
Reply to comment by Anonymous-USA in If you could instantaneously place a space telescope at any desired distance (LYs), from any planet/galaxy etc., where would it be and what would you be documenting? And for what purpose? by kennyarsen
Close, but one issue. The observation is relative to the observer. The speed of expansion is the same everywhere. But, I understand what you were saying.
AurumArgenteus t1_j67jx1g wrote
Reply to comment by Varsect in If you could instantaneously place a space telescope at any desired distance (LYs), from any planet/galaxy etc., where would it be and what would you be documenting? And for what purpose? by kennyarsen
I think it's plausible, but I bet we aren't allowed to submit support tickets regardless of how we complain.
Varsect t1_j67ju1h wrote
Reply to comment by AurumArgenteus in If you could instantaneously place a space telescope at any desired distance (LYs), from any planet/galaxy etc., where would it be and what would you be documenting? And for what purpose? by kennyarsen
I personally think the simulation idea isn't true. But hey, maybe.
[deleted] t1_j681vn9 wrote
Reply to If you could instantaneously place a space telescope at any desired distance (LYs), from any planet/galaxy etc., where would it be and what would you be documenting? And for what purpose? by kennyarsen
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