Amalthea, Jupiter's innermost satellite, was discovered in 1892. It is so small—165 mi (265 km) long and 90 mi (150 km) wide—that it is extremely difficult to observe from Earth. Amalthea…
FebruaryFor terms in boldface, see Astronomical Terms.DayPhenomenon Hour2LAST QUARTER07002Jupiter appears to be motionless in the sky as it goes from direct motion to retrograde motion.…
Why two celebrations?
Related Links
Easter Features
Quick Guide to the Dates of Passover and Easter
Sweet Easter Facts
Movable Feasts
Kosher for Passover…
(Encyclopedia) ring, in astronomy, relatively thin band of rocks and dust and ice particles that orbit around a planet in the planet's equatorial plane. All four of the giant planets in the solar…
(Encyclopedia) Pluto, in astronomy, a dwarf planet and the first Kuiper belt, or transneptunian, object (see comet) to be discovered (1930) by astronomers. Pluto has an elliptical orbit usually lying…
Top of Page
Disaster News | US News | World News
As sciences marches on, you can sometimes feel like you're getting left in the dust. Infoplease has what you need to stay in the know. Here are the…
Lunar Orbiter. Series of spacecraft designed to orbit the Moon, taking pictures and obtaining data in support of the subsequent staffed Apollo landings. The U.S. launched five Lunar Orbiters…
Trending
Here are the facts and trivia that people are buzzing about.
World's Most Corrupt Leaders & Politicians
Western Christian Holidays, 2010-2030
The Best Movie Quotes of All Time!
Top 10 Biggest Waterfalls in the World (Tallest, Widest, & Most Volume!)
