|
Proposed in the 19th century, Olbers' Paradox questions why light from these doesn't illuminate the night sky |
stars
|
$400 |
DJ |
ASTRONOMY |
2009-01-20 |
#5612 |
|
Oh my heavens! In 1706 Danish astronomer Olaus Roemer published a new catalog listing these |
stars
|
$400 |
DJ |
ASTRONOMERS |
2008-11-24 |
#5571 |
|
Helen Hogg found over 200 of the variable type of these, whose light varies in helpfully regular intervals |
stars
|
$400 |
J |
ASTRONOMERS |
2002-05-24 |
#4095 |
|
Around 1700 John Flamsteed, the first Astronomer Royal, compiled a numbered catalog of these |
stars
|
$500 |
J |
ASTRONOMY |
1993-12-10 |
#2135 |
|
The word constellation is from Latin meaning these "together" |
stars
|
$200 |
DJ |
CONSTELLATIONS |
1987-04-23 |
#619 |
|
They can be classified as blue giants or white dwarfs |
stars
|
$200 |
DJ |
ASTRONOMY |
1986-09-24 |
#468 |
|
Since ancient Greece, their brightness has been measured in magnitude |
stars
|
$400 |
DJ |
ASTRONOMY |
1985-09-20 |
#270 |