Decades of constant X-ray emission from the Helix Nebula’s white dwarf suggest debris from a Jupiter-sized planet steadily rains upon the star.

“In the first couple of hours after dark ... glow in the southwestern sky, with Jupiter in the southern sky and Mars in the southeast or east. The planets will shine brighter than the stars ...

"The Sun is just one among a hundred billion stars in the Milky Way Galaxy, each with its own cosmic tale to tell." — Timothy Ferris, in the film Seeing in the Dark The stars seem to change ...

Fortunately, in modern consumer products like watches and glow-in-the-dark stars, the radioluminescence has been replaced by photoluminescence aka phosphor that emits light of one frequency after ...

“Our device employs a scintillator, a specialized material that absorbs these gamma rays and converts their energy into visible light — similar to how glow-in-the-dark objects ...

Dr. Lawless International Dark Sky Park ... also observe the planets Jupiter and Mars. A total lunar eclipse, also known as a "blood moon," will cast a coppery reddish glow in the sky in the ...