helium from greek ἥλιος translit helios lit sun is a chemical element with symbol he and atomic number 2 it is a colorless odorless tasteless nontoxic inert monatomic gas the first in the noble gas group in the periodic tableits boiling point is the lowest among all the elementsafter hydrogen helium is the second lightest and second most abundant element in the.
Stars are formed when enormous clouds of gas lightyears 1 in diameter collapse under their own gravity interstellar clouds would make a very very good vacuum on earth but the space around them would make an even better vacuum so clouds they are.
High radium ra concentrations in potable portions of the cambrianordovician co aquifer system were investigated using waterquality data and environmental tracers 3 h 3 he trit sf 6 14 c and 4 he rad of groundwater age from 80 publicsupply wells pswsgroundwater ages were estimated by calibration of tracers to lumped parameter models and ranged from modern lt50 yr in upgradient.
It was the most notorious scientific experiment in recent memory in 1989 the two men who claimed to have discovered the energy of the future were condemned as imposters and exiled by their.
case for moon first gateway to entire solar system open ended exploration planetary protection at its heart copyright 169 robert walker uk all rights reserved.