-
early state of the universe,
which indicate an age of 13.787±0.020
billion years as
interpreted with the Lambda-CDM
concordance model as of 2021; and...
-
Across a
Billion Years is a 1969
science fiction novel by
American writer Robert Silverberg. Set in the year 2375, it
follows Tom Rice, a
young archaeologist...
- Five
Billion Years of Change: A
History of the Land (2003, ISBN 157230958X) is a book by
Denis Wood that
attempts a
holistic view of
reality that ranges...
-
abbreviation for "
billion years ago". It is
commonly used as a unit of time to
denote length of time
before the
present in 109
years. This
initialism is...
-
fuses about 600
billion kilograms (kg) of
hydrogen into
helium and
converts 4
billion kg of
matter into energy.
About 4 to 7
billion years from now, when...
- 6 light-
years across (about 1017 m, or 62 trillion miles).
Cosmic expansion subsequently decelerated to much
slower rates,
until around 9.8
billion years after...
-
contain 100–400
billion stars and at
least that
number of planets. The
Solar System is
located at a
radius of
about 27,000 light-
years (8.3 kpc) from the...
-
North China,
lived approximately 1.65
billion years ago. Some
acritarchs are
known from at
least 1.65
billion years ago, and a fossil, Grypania,
which may...
-
Boring Billion,
otherwise known as the Mid
Proterozoic and Earth's
Middle Ages, is an
informal geological time
period between 1.8 and 0.8
billion years ago...
- made
between abbreviation "yr" for
years and "ya" for
years ago,
combined with
prefixes for thousand, million, or
billion. In archaeology,
dealing with more...
