Yeah, I mean getting the parents to sign an explicit contract and taking a photo of them signing... They were aiming to do the right thing.
You can't use triangulation for anything over a few light-years, the angles are just too acute. And even then, you need to use the full width of Earth's orbit (i.e. repeat a measurement at different times of the year).
I think they just know what the frequency distribution normally is for a burst like this when it is emitted, and use the redshift of the measured frequencies to estimate the distance. Plus they correlate it with the apparent source based on direction (a certain galaxy, in this case, which helped confirm the distance estimate).
https://en.wikipedia.org/wiki/Shiv_(weapon)
Inmates make knives out of the weirdest things.
There is such a thing as Sun-synchronous polar orbits (an example).
Dread it, run from it...
No, that's brilliantly executed!
It's called a job. You demoncrats wouldn't know anything about that.
/s
I understand the saliva has a benefit for mosquitoes, but not the swelling and the itching (the "unpleasantness" in the title). In essence, our bodies hung this not-otherwise-useful allergic response on something the mosquitoes couldn't/wouldn't/didn't give up and which was firmly specific to their bites, to single them out.
If there was no saliva our bodies would be pressured by natural selection to pick some other mechanism to make their bites unpleasant. An allergy to their chitin or a phobia to the sound of their wings, etc.
Evolutionary pressure from mosquitoes has probably been no small thing.
The way our bodies react to mosquito saliva motivates us to avoid being bitten. Which must have had evolutionary benefits, keeping us away from diseases.
I.e. all those people that didn't mind them and never got itchy from mosquito bites appear to have died out. And mosquitoes really wish that wasn't true.
Ok, I guess the idea that the CMB suggests movement relative to a quasi-absolute reference frame really has become disputed lately... I also found this newer paper by the same authors. It's a pity, I liked the idea.
The image just loaded very slowly for me (i.e. after about 10 seconds). In some posts it never loads at all, but there is a thumbnail in the main screen. This is on sync.
Well, following the main reference in the Wikipedia page leads to this:
The implied velocity for the Solar System barycenter is v = 369.82 ± 0.11 km s−1, assuming a value T0 = Tγ , towards (l, b) = (264.021◦ ± 0.011◦, 48.253◦ ± 0.005◦) [13]. Such a Solar System motion implies a velocity for the Galaxy and the Local Group of galaxies relative to the CMB. The derived value is vLG = 620 ± 15 km s−1 towards (l, b) = (271.9◦ ± 2.0◦, 29.6◦ ± 1.4◦) [13], where most of the error comes from uncertainty in the velocity of the Solar System relative to the Local Group. The dipole is a frame-dependent quantity, and one can thus determine the ‘CMB frame’ (in some sense this is a special frame) as that in which the CMB dipole would be zero. Any velocity of the receiver relative to the Earth and the Earth around the Sun is removed for the purposes of CMB anisotropy studies, while our velocity relative to the Local Group of galaxies and the Local Group’s motion relative to the CMB frame are normally removed for cosmological studies. The dipole is now routinely used as a primary calibrator for mapping experiments, either via the time- varying orbital motion of the Earth, or through the cosmological dipole measured by satellite experiments.
Do any references suggest this dipole is under debate?
Is it controversial? I thought it was pretty established. In Wikipedia it says:
From the CMB data, it is seen that the Sun appears to be moving at 369.82±0.11 km/s relative to the reference frame of the CMB (also called the CMB rest frame, or the frame of reference in which there is no motion through the CMB). The Local Group — the galaxy group that includes our own Milky Way galaxy — appears to be moving at 620±15 km/s in the direction of galactic longitude ℓ = 271.9°±2°, b = 30°±3°.[88] The dipole is now used to calibrate mapping studies.
Relative to the Cosmic Microwave Background. Seems to be the closest thing to an absolute reference frame.
Yes, that's right. There's a "no" at the beginning of the phrase which gives it that meaning (I misread it myself, so I see where you're coming from).
TL;DR: "No 14 year old boy will stop following someone if they're considered evil and bad, but they will stop if they're considered cringe".