PULL · 7 DEC 2021 This was
This was
your sky.
Ninety Gravitational Wave Spectrograms and Counting
NASA APOD
COSMIC MESSAGE
Every time two massive black holes collide, they send out a loud chirping sound in gravitational waves. Humanity has only been able to detect these chirps for seven years, but we have already heard about 90 of them. This image shows spectrograms, plots of gravitational wave frequency versus time, detected by LIGO, VIRGO, and KAGRA.
CREDIT
PUBLIC DOMAIN NASA APOD
EXPORT AS
SB-2021-12-07
COMMON 
2021-12-07 · ♐
SKYBORN
Ninety Gravitational Wave Spectrograms and Counting
NASA APOD
BORN 1664 days ago
SKYBORN.APP
ZODIAC CONTEXT
♐
SAGITTARIUS
In tropical astrology, 7 DEC 2021 falls under Sagittarius (♐). The sign's window runs from 11-22 through 12-21. Sagittarius points straight at the center of the Milky Way, our galaxy's brightest region. The Sun was crossing this region of the sky on 7 DEC 2021.
THE ALMANAC FOR 7 DEC 2021
DAY
Tuesday
MOON
Waxing crescent, 10% lit
POSITION
Day 341 of 365
SAME DAY, OTHER YEARS
NEARBY DATES