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2. Age of Earth - Wikipedia

   en.wikipedia.org/wiki/Age_of_Earth

   In 1862, the physicist William Thomson, 1st Baron Kelvin published calculations that fixed the age of Earth at between 20 million and 400 million years. [19] [20] He assumed that Earth had formed as a completely molten object, and determined the amount of time it would take for the near-surface temperature gradient to decrease to its present value.

3. List of star systems within 75–80 light-years - Wikipedia

   en.wikipedia.org/wiki/List_of_star_systems_within...

   This is a list of star systems within 75–80 light years of Earth . The closest B-type star, Regulus, is in this list. Star system ← → ← →. Median distance ( ly ) Stars in system. Spectral type. Apparent magnitude (V) Comments and references.

4. Health threat from cosmic rays - Wikipedia

   en.wikipedia.org/wiki/Health_threat_from_cosmic_rays

   Health threats from cosmic rays are the dangers posed by cosmic rays to astronauts on interplanetary missions or any missions that venture through the Van-Allen Belts or outside the Earth's magnetosphere. [ 1][ 2] They are one of the greatest barriers standing in the way of plans for interplanetary travel by crewed spacecraft, [ 3][ 4][ 5] but ...

5. Cosmic Calendar - Wikipedia

   en.wikipedia.org/wiki/Cosmic_Calendar

   A graphical view of the Cosmic Calendar, featuring the months of the year, days of December, the final minute, and the final second. The Cosmic Calendar is a method to visualize the chronology of the universe, scaling its currently understood age of 13.8 billion years to a single year in order to help intuit it for pedagogical purposes in science education or popular science.

6. Geologic time scale - Wikipedia

   en.wikipedia.org/wiki/Geologic_time_scale

   The geologic time scale is a way of representing deep time based on events that have occurred throughout Earth's history, a time span of about 4.54 ± 0.05 Ga (4.54 billion years). [ 5] It chronologically organises strata, and subsequently time, by observing fundamental changes in stratigraphy that correspond to major geological or ...

7. What vitamins should you take? Why experts say some ... - AOL

   www.aol.com/vitamins-why-experts-answers-big...

   What vitamins should not be taken daily? There can be too much of a good thing, which is why health experts want consumers to be wary of regularly taking supplements that medical pros haven't told ...