(Encyclopedia) Brahe, TychoBrahe, Tychotīˈkō brä [key], 1546–1601, Danish astronomer. The most prominent astronomer of the late 16th cent., he paved the way for future discoveries by improving…
(Encyclopedia) SiriusSiriussĭrˈēəs [key], or Dog Star, brightest star in the sky. It is located in the constellation Canis Major (1992 position R.A. 6h44.8m, Dec. −16°42′); its Bayer designation is…
(Encyclopedia) tektitetektitetĕktīt [key], naturally occurring, silica-rich (65%–80% SiO2) glass resembling obsidian and sometimes shale, and is normally jet black to olive green. They appear as…
(Encyclopedia) TethysTethystēˈthĭs [key], in astronomy, one of the named moons, or natural satellites, of Saturn. Also known as Saturn III (or S3), Tethys is 659 mi (1060 km) in diameter, orbits…
(Encyclopedia) United States Naval Observatory, a federal astronomical observatory, located in Washington, D. C. It evolved from the Navy's oldest scientific institution, the Depot of Charts and…
This table lists the top-grossing movies of 2009. Transformers: Revenge of the Fallen made the most money in the United States in 2009.
Rank Title Total Gross 1. Transformers: Revenge…
This table lists the top-grossing movies of 2011. Harry Potter made the most money in the United States in 2011.
Rank Title Total Gross 1. Harry Potter and the Deathly Hallows Part II…
HOW WERE THE SUMERIAN CITIES RULED? HOW WERE THE ZIGGURATS BUILT? FIND OUT MOREMesopotamia is the land between the Tigris and Euphrates rivers. Farmers used the river water to irrigate fields and…
(Encyclopedia) time, sequential arrangement of all events, or the interval between two events in such a sequence. The concept of time may be discussed on several different levels: physical,…
CLOUDY ATMOSPHEREFIND OUT MOREVenus is only a little smaller than Earth, is made up of rock, and has an atmosphere, but it is otherwise quite unlike our planet. Its surface is covered with…
