HDE 226868

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Battle of the Alamo from "Texas: An Epitome of Texas History from the Filibustering and Revolutionary Eras to the Independence of the Republic, 1897. Texas Revolution, Texas revolt, Texas independence, Texas history.

6 Wars of Independence

Groups of depositors in front of the closed American Union Bank, New York City. April 26, 1932. Great Depression run on bank crowd

Causes of the Great Depression

illustration of the walking titanosaurus, Patagotitan mayorum

Titanosaurs: 8 of the World's Biggest Dinosaurs

Lusitania sinking, illustration from The War of the Nations (New York), December 31, 1919. World War I, WWI. This image is one of three on the page. (See source file for the other two.)

7 of the World’s Deadliest Shipwrecks

New Zealand. Political/Physical map. Includes locator.

Where Is “Old Zealand”?

Two chicks near an egg with a white background (poultry, chick, chickens, birds).

What Do Eggs Have to Do with Easter?

Titanic infographic. The 30th anniversary of its discovery is September 1, 2015. SPOTLIGHT VERSION.

Timeline of the Titanic’s Final Hours

HDE 226868

star

Learn about this topic in these articles:

Cygnus X-1

In Cygnus X-1
The primary star, HDE 226868, is a hot supergiant revolving about an unseen companion with a period of 5.6 days. Analysis of the binary orbit led to the finding that the companion has a mass greater than seven solar masses. (The mass has been determined from subsequent observations…
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