Recent content by JimJCW

Corresponding result obtained with LightCone8:

Let’s use Gnedin’s calculator to do the demonstration. If we aim a telescope to a direction in space, we receive photons from galaxies at various distances. Let’s assume that each of these galaxies emits a pulse of photons now at the same time. We want to know when these photon pulses will reach...

Let’s label the galaxies in question as G-DL-z1.8 and illustrate the above writing with a diagram. LightCone8 and PLANCK(2018+BAO) data gives the following result: In the figure, the distances to the event horizon and to the G-DL-z1.8 galaxies are plotted as functions of cosmic time. The...

Using LightCone8 Cosmological Calculator and PLANCK(2018+BAO) data as input, we can get the following result: In the figure, Dhor is the event horizon and Dpar is the radius of the observable universe. Currently (t = 13.79 Gyr) Dhor has a value of 16.58 Gly. Does the event horizon have any...

You are right. Thanks for pointing out my mistake. Post #10 and #32 use the following LightCoe8 output:

Similar to the result for z = 1091.6 (see Post #10), for z = 16.7, we can get the following information: At t = 230.329 Myr, the CEERS-93316 photons we receive today were located at a distance of 1.9621 Gly from our location. At that time, CEERS-93316 had a recession speed of 2.40314c. Now it...

If we have a tank of water and use half of the remaining amount a day, maybe we can use it forever.

I think Ethan overlooks the existence of event horizon in his article when he writes, In other words, the Universe will never run out of photons for us to see. There will always be a faraway place, from our perspective, where the Universe is first forming stable, neutral atoms. At that...

From the calculation result shown below, it is estimated that it takes 1.45 Myr for the wavelengths of the CMB to increase by a factor of 1.0001. z Scale (a) Tnow Gyr Time from now Gyr 0.000000000E+00 1.000000000E+00 1.378704250E+01 -1.000000000E-04 1.000100010E+00...

The radius of the observable universe becomes bigger and bigger with increasing age of the universe. Using the calculator and data mentioned in Post #10, one gets the following: The Webpage you cited gives the following message:

You are right. It works for me too.

Hi @Jorrie, What is the status of LightCone8 Cosmological Calculator (v8.3.x) at http://jorrie.epizy.com/docs/? It still gives incorrect Dhor (Ro and Dhor overlap): Please see Post #69.

Using the calculator and data mentioned in Post #10, we can get the following result: Lights emitted outside the event horizon now (Dhor > 16.58 Gly) will never reach our location, even the emitters are inside the observable universe (Dpar < 46.189 Gly).

Using LightCone8 calculator and PLANCK(2018+BAO) data, for z = 1091.6, we can get the following information: At t = 379,500 year, the CMB photons we receive today were located at a distance of 0.04144 Gly from our location. Nearby matter had a recession speed of 66.416c. Now the matter is...

In Post #22, it is demonstrated that the calculation results from Lightcone8 and ICRAR are consistent for z = 0.02. A similar conclusion can be reached for z = 300000: LightCone8 ICRAR z 300000 300000 Scale (a) 3.33332222E-06 3.33332222E-06 T Gyr 8.34828635E-09 8.34837088E-09...