Recent content by Helio

SR can address acceleration, on a limited basis, because it can be treated in iterations, one ref. frame change at a time, more or less. [Not that I would know how, but that's what physicists have stated.] It helps to recall Einstein's original name for "Relativity". He called it his...

I would like to correct a very common error regarding Hubble. “The constant would be removed from thought when Edwin Hubble convinced Einstein that the universe is non-static. It's expanding, he argued. And as far as we know today, Hubble was indeed correct.” Hubble was explicit in letting...

Yep, the latter point makes it a Jr. I assume it’s IR spectral sensitivity is about the same, but perhaps I’m wrong.

This looks like a JWST, Jr. on Earth, is it not?

Since force is a way to model gravity, i.e. Newton, then I suspect the expansion can be treated as such in the case such as the Moon’s radial movement. Thus it would the sum of the forces, but the expansion “ force” is super tiny compared to Earth’s force. Yes. Einstein, de Sitter, Edington...

Rob noted that we are limited to the point when the universe suddenly became transparent, which we see today as the CMBR. This happened when the cooling of space due to expansion reached a temp. of about 3000K. This caused the free electrons to suddenly become trapped by the nuclei (H & He)...

:) Ok, but I was thinking that your adventure pictures would be interesting.

Great stories. Any pics? :)

Ug, that was a worse experience than my travel south for 60 miles to see the comet. It was a clear night and as I was establishing my focus on Saturn when, suddenly, the focus became worse and worse. I looked up and within seconds the entire sky was overcast. But, we were near a tank (pond)...

The problem might be found in the noise. A terrestrial scope is stuck with a light flux from the sky that isn't that insignificant, especially with today's light pollution. A space scope will still have to see Earthshine on the dark side of the Moon. [I can't imagine how a candle could be...

Lots of helpful info. Thanks.

Converts are always fun to hear from! Apology accepted. ;) Nice article and well-written! It takes talent to better define the world during moments when it exhibits strange behavior. [Is this a prerequisite for Space.com writers? ;)] A total eclipse is one of these moments. It's uncommon...

Today's APOD [ here] tells some of the story of the Sun's color history. The Thomson Scattering effect of sunlight through the corona reveals the Sun's true color, but this image is filter-free. With filters, the Sun goes back to playing the yellow Sun game.

Bless you my son. :p

Yeah, I was just joking about the fact that there's no umbral shadow (ignoring the darkening) below the clouds, but above them.