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Sedna has a V band absolute magnitude of about 1.8, and is estimated to have an albedo (reflectivity) of around 0.41, giving it a diameter of approximately 900 km. [14] At the time of discovery it was the brightest object found in the Solar System since Pluto in 1930.
Astronomer Mike Brown, who co-discovered Sedna in 2003, believes it to be the most scientifically important trans-Neptunian object found to date, as understanding its peculiar orbit is likely to yield valuable information about the origin and early evolution of the Solar System.
"Eventually, when other fossil records are found, Sedna will help tell us how the Sun formed and the number of stars that were close to the Sun when it formed." [ 30 ] A 2007–2008 survey by Brown, Rabinowitz and Schwamb attempted to locate another member of Sedna's hypothetical population.
The timeline begins at the Bronze Age, as it is difficult to give even estimates for the timing of events prior to this, such as of the discovery of counting, natural numbers and arithmetic. To avoid overlap with timeline of historic inventions , the timeline does not list examples of documentation for manufactured substances and devices unless ...
Indigenous people lived in what is now Texas more than 10,000 years ago, as evidenced by the discovery of the remains of prehistoric Leanderthal Lady.In 1519, the arrival of the first Spanish conquistadors in the region of North America now known as Texas found the region occupied by numerous Native American tribes.
28 BCE – Chinese history book Book of Han makes earliest known dated record of sunspot. [ 34 ] c. 150 CE – Claudius Ptolemy completes his work Almagest , that codifies the astronomical knowledge of his time and cements the geocentric model in the West, and it remained the most authoritative text on astronomy for more than 1,500 years.
Here's a look back at Texas queer history, beginning with the first public Pride events in the 1970s. ... Pride events in Texas date back to the 1970s, following the June 1969 riots at New York ...
April 5, 1986 - City takes part in celebration of Texas' Sesquicentennial, 25th Anniversary of NASA, and the Houston International Festival with Rendez-vous Houston concert. At the time it is the largest outdoor concert in history and is entered into the Guinness Book of World Records.