PULL · 15 APR 2007 This was
This was
your sky.
M3: Inconstant Star Cluster
NASA APOD · J. Hartman &
(Harvard CfA) &
K. Stanek
(Ohio State U.)
COSMIC MESSAGE
Star clusters appear static in photos, but their stars are constantly moving and changing brightness. Globular cluster M3, shown here in a time-lapse, reveals these changes over a single night. Most of the variable stars visible are RR Lyrae stars, which pulsate predictably. While a star takes about 100,000 years to cross the cluster, its brightness can fluctuate noticeably in less than a night.
CREDIT
© COPYRIGHTED J. Hartman &
(Harvard CfA) &
K. Stanek
(Ohio State U.) · J. Hartman &
(Harvard CfA) &
K. Stanek
(Ohio State U.) · used by permission via NASA APOD · not for redistribution.
EXPORT AS
SB-2007-04-15
©
UNCOMMON 
2007-04-15 · ♈
SKYBORN
M3: Inconstant Star Cluster
NASA APOD · J. Hartman &
(Harvard CfA) &
K. Stanek
(Ohio State U.)
BORN 7014 days ago
SKYBORN.APP
ZODIAC CONTEXT
♈
ARIES
In tropical astrology, 15 APR 2007 falls under Aries (♈). The sign's window runs from 03-21 through 04-19. Aries is the constellation traditionally tied to spring's arrival in the northern hemisphere. The Sun was crossing this region of the sky on 15 APR 2007.
THE ALMANAC FOR 15 APR 2007
DAY
Sunday
MOON
Waning crescent, 5% lit
POSITION
Day 105 of 365
SAME DAY, OTHER YEARS