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The first letter shows when the object in space was discovered. The "U" shows the period October 16-31. The second letter shows what order the object was found in the amount of time the first letter represented. A= first, B= 2, C= third, and so on. Basically, Eris (Planet 2003 UB313) was found between October 16-21, and was the second object discovered in that period of time.
(See http://www.NASA.gov/audience/forstudents/5-8/features/F_Tenth_Planet.html for more info)
What else can I help you with?
What elements have their first two letters as a symbol?
The symbols for elements have either one or two letters. If there are two letters, the first one is capitalized and the second one is not.
What is the symbol that always one or two letters?
The symbol that always represents either one or two letters is the chemical symbol. Each element on the periodic table is represented by a unique chemical symbol, typically consisting of one or two letters.
Are most elements represented in one letter or two letters?
Most are represented by two letters. It would be impossible for most to be represented by one letter as there are more than twice as many elements as there are letters.
Does the magnet attract mercury?
two letters no!
Chemical symbols use one or two letters from what name?
Chemical symbols use one or two letters from the name of the element.
What two letters mean to rot?
The two letters that mean to rot are "D" and "E".
What two letters mean a host?
The two letters are MC. MC stands for 'Master of Ceremonies'.
What two letters mean the opposite of full?
The two letters that mean the opposite of full are "e" and "m", representing the word "em" which means empty.
What two letters mean cold?
IC (Icy)
What two letters mean to go rotten?
rr
What two letters mean a kind of composition?
sc
What two letters mean a tent?
portable shelter
What is the distance between these two points on a number line 178 and 313?
It is 313 - 178 = 135.
What letter and a number mean ahead of or in front of?
what two letters express the meaning not difficult? A: EZ (easy) what two letters mean the opposite of full? A: MT (empty) what two letters mean "very cold" A: IZ (ice) what number and letter spell a popular outdoor game? A: 10s (tennis)
What is a word that mean's eating cavity that has two letters?
os
What two letters of the alphabet mean nothing?
MT (empty)
What 2 letters mean very cold?
The two letters that mean very cold are "B" and "C", indicating temperatures below freezing point.
