Because there is so much of it, and because it is spread out so uniformly and diffusely between galaxies, Davidsen concludes that the helium was not created in the nuclear furnaces of stars but was made when the world was new.
22.
The lyrics of the first stanza of " Why Does the Sun Shine ? " also appear verbatim in the book " Stars : A Golden Guide ", apart from the omission of " its core is " before " a gigantic nuclear furnace ".
23.
Astronomers from Pennsylvania State University described Chandra's detection of more than 1, 000 young stars in the Orion Nebula, including some objects so small that they may fail to reach stardom and wind up as brown dwarfs, stellar objects not large enough to have nuclear furnaces.
24.
Other quasar studies yielded the second clue : some of the distant gas clouds contained not only hydrogen but heavy elements like carbon, which are produced only by the nuclear furnaces inside stars and scattered through space when stars explode at the end of their lives.
25.
Jupiter is believed to resemble the infant sun in many respects; it is too small to ignite the hydrogen-fueled nuclear furnace that powers the sun, but its chemical composition is believed to be essentially the same as that of the sun at the birth of the solar system.
26.
The United States tested twenty different sizes and designs during Project Rover and NASA's NERVA program from 1959 through 1972 at the Nevada Test Site, designated Kiwi, Phoebus, NRX / EST, NRX / XE, Pewee, Pewee 2 and the Nuclear Furnace, with progressively higher power densities culminating in the Pewee 2.
27.
The last NRX firing lost a relatively small of fuel in 2 hours of testing, enough to be judged sufficient for space missions by SNPO . Pewee 2's fuel elements reduced fuel corrosion still further, by a factor of 3 in Nuclear Furnace testing, but Pewee 2 was never tested on the stand.
