2016-03-20 (Sunday)

Today, I learned that:

Astronomy continues to be such a fascinating science! Today’s podcast from 365 days of Astronomy deals with the latest feat by the NASA/ESA Hubble Space Telescope. Recently, it was able to reach out to photograph a galaxy that lies at a distance bigger than we have ever traveled before, 13,4 billion light-years. More about this amazing fact can be found in references # 1 and # 2 below.

hubble

This photo is a look 13,4 billion years back in time, when our Universe was only 400 million years old. The NASA/ESA Hubble Space Telescope has broken the record for how far back we have been able to look. The galaxy that is the star (!) of this photo is named GN-z11.

And speaking about celestial objects, today we also learned that the fear of getting sick by the Sun which has led to that many people are trying to hide from it can have negative consequences on our body. An article in the April issue of Journal of Internal Medicine presents a study made in the South of Sweden:

“There were 2545 deaths amongst the 29 518 women who responded to the initial questionnaire. The authors found that all-cause mortality was inversely related to sun exposure habits. The mortality rate amongst avoiders of sun exposure was approximately twofold higher compared with the highest sun exposure group, resulting in excess mortality with a population attributable risk of 3 %. The results of this study provide observational evidence that avoiding sun exposure is a risk factor for all-cause mortality. Following sun exposure advice that is very restrictive in countries with low solar intensity might in fact be harmful to women’s health.”

See references #3 and #4 below for more information.

And speaking once more about the Sun, as you probably already know today occured the March Equinox, when the day and night are practically of equal length all over the world. But if you live on the Northern Hemisphere, then you can look forward to an increased amount of day light during the coming three months, culminating with the Solstice around mid-summer. (The situation for us in the Southern Hemisphere is of course inverse, the days are slowly getting shorter now …) Reference #5 below has more information about the Equinox.

… That’s what I learned in school !

Refs.:

1: Hubble Breaks The Cosmic Distance Record, 365 days of Astronomy

2: Hubble Breaks The Cosmic Distance Record, Space Telescope

3: Avoidance of sun exposure is a risk factor for all-cause mortality: results from the Melanoma in Southern Sweden cohort

4: För lite sol kan vara skadligt

5: Equinox

+: What did you learn in school today ?

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