Drop a ball. It falls down.
A tug did it.
Earth has a tug on you.
The moon can tug the sea.
Earth can tug the moon.
The sun can tug Earth.
Words to know
- tug: a pull
Facts
Facts the Peabody Encyclopedia for kids
Real facts about everything, written for your grade.
Down, Down, Down
Gravity: What is gravity?
Read next
Sources
- https://spaceplace.nasa.gov/what-is-gravity/en/
- https://www.astronomy.ohio-state.edu/~pogge/Ast161/Au06/Unit4/gravity.html
- https://openstax.org/books/university-physics-volume-1/pages/5-4-mass-and-weight
- https://www.nasa.gov/missions/station/what-is-microgravity/
- https://science.nasa.gov/moon/facts/
- https://oceanservice.noaa.gov/facts/tides.html
- https://www.esa.int/Science_Exploration/Space_Science/What_is_gravity
- https://oceanservice.noaa.gov/education/tutorial_tides/tides02_cause.html
- https://pwg.gsfc.nasa.gov/stargaze/Sfall.htm
- https://ebsco.com/research-starters/astronomy-and-astrophysics/theory-universal-gravitation
- https://spaceplace.nasa.gov/orbits/en/
- https://science.nasa.gov/universe/black-holes/
- https://www.nsf.gov/news/we-got-it-astronomers-reveal-first-image-black-hole-heart
- https://esahubble.org/wordbank/gravitational-lensing/
- https://spaceplace.nasa.gov/gravitational-waves/en/
- https://www.ligo.caltech.edu/page/what-are-gw
- https://www.ligo.caltech.edu/news/ligo20160211
- https://www.nist.gov/node/1879246
- https://www.black-holes.org/the-science/relativity/warped-point-of-view
- https://science.nasa.gov/dark-matter/
- https://home.cern/science/physics/dark-matter
- https://encyclopedia.com/science/encyclopedias-almanacs-transcripts-and-maps/cavendish-experiment-and-quest-determine-gravitational-constant
- https://nssdc.gsfc.nasa.gov/planetary/lunar/apollo_15_feather_drop.html
- https://physics.nist.gov/cgi-bin/cuu/Value?bg
- https://einstein.stanford.edu/SPACETIME/spacetime2.html
- https://eclipse-history.wp.st-andrews.ac.uk/the-controversial-british-led-eclipse-expeditions-of-1919-that-validated-general-relativity/
- https://science.nasa.gov/mission/grace-fo/
- https://einstein.stanford.edu/
- https://www.ligo.caltech.edu/page/gw-sources
- https://cerncourier.com/a/gravitys-quantum-side/
- https://science.nasa.gov/universe/black-holes/anatomy/
- https://curious.science.org.au/node/325
- https://www.esa.int/Science_Exploration/Space_Science/LISA
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