... Most stars appear only as points of light. ... Helios Helium . ... This image of the active Sun was made using ultraviolet light emitted by ionized Helium atoms in the Solar chromosphere. ... Black Holes Are Black . ... 2001: A Total Lunar Eclipse . ... Spiral Galaxy NGC 3310 in Ultraviolet . ... Most of this gas is hydrogen, some is helium, but there is a trace amount of relatively heavy molecules, including carbon monoxide (CO) - a component of smog. ... Kepler Discovers How Planets Move . ...