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gravity
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gravitational lens
Understand the concept of gravitational force using Newton's theory of gravitation
effects of gravity on the Moon and Earth gravitational force variation in Earth's gravitational field
View a demonstration to understand Albert Einstein's general theory of relativity
experimental evidence for general relativity
Know about the application of gravitational waves in science and in everyday life
Laser Interferometer Space Antenna (LISA) black hole in M87
For Students
gravity summary
Quizzes
Italian-born physicist Dr. Enrico Fermi draws a diagram at a blackboard with mathematical equations. circa 1950.
Physics and Natural Law
Nicolaus Copernicus. Nicolas Copernicus (1473-1543) Polish astronomer. In 1543 he published, forward proof of a Heliocentric (sun centered) universe. Coloured stipple engraving published London 1802. De revolutionibus orbium coelestium libri vi.
All About Astronomy
Italian physicist Guglielmo Marconi at work in the wireless room of his yacht Electra, c. 1920.
All About Physics Quiz
Related Questions
Read Next
Above the clouds 130 nautical miles below, astronaut Mark C. Lee floats freely without tethers as he tests the new Simplified Aid for Extravehicular Activity (EVA) Spacewalk Rescue (SAFER) system, Sept. 16, 1994. Space Shuttle Discovery, STS-64
Gravity: From Apples to the Universe
Albert Einstein
100 Years of General Relativity
Galaxy clusters like Abell 2744 can act as a natural cosmic lens, magnifying light from more distant, background objects through gravity. NASA's James Webb Space Telescope may be able to detect light from the first stars in the universe if they are gravitationally lensed by such clusters. (astronomy, space exploration, galaxies)
How Fast Is the Universe Expanding?
Infinite space background with silhouette of telescope. This image elements furnished by NASA.
Telescopes: Seeing Stars
Planet Jupiter with its moon Io at left, photographed by the Cassini orbiter during the Cassini-Huygens mission, 2000. spacecraft
7 Important Dates in Jupiter History
Discover
Young men throw balloons and glitter from above the mosque at the celebration Eid Al-Fitr after prayers playing with balloons outside of Al-seddeeq mosque, Al-Mansourah, Egypt. 17 July 2015.
Eid al-Fitr
Periodical Cicada, Adult, Magicicada spp. Requires 17 years to complete development. Nymph splits its skin, and transforms into an adult. Feeds on sap of tree roots. Northern Illinois Brood. This brood is the largest emergence of cicadas anywhere
Why Do Some Cicadas Appear Only Every 17 Years?
earthquake. Heavily damaged school in the town of Yingxiu after a major earthquake struck China's Sichuan Province on May 12, 2008.
The 6 Deadliest Earthquakes Since 1950
Julius Caesar in full Gaius Julius Caesar (100? BCE-44 BCE) statue in Rimini, Italy. Roman general and statesman and dictator
The Time Julius Caesar Was Captured by Pirates
Stylish light blue jeans on wooden background, closeup of inset pocket
Why Do Jeans Have That Tiny Pocket?
Person paying with a credit card using a credit card terminal. Cashless payment, credit card reader
What Is a Cashless Society and How Does It Work?
Black widow spider
9 of the World’s Deadliest Spiders

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Videos

Understand the concept of gravitational force using Newton's theory of gravitation
Explanation of gravitational force.
Video: Encyclopædia Britannica, Inc.
View a demonstration to understand Albert Einstein's general theory of relativity
Explore general relativity.
Video: © World Science Festival (A Britannica Publishing Partner)
Know about the application of gravitational waves in science and in everyday life
Learn about the significance of gravitational waves in science and in everyday life.
Video: Courtesy of Northwestern University (A Britannica Publishing Partner)
Newton's law of gravitation: Apollo 15 gravitation experiment
Apollo 15 commander David Scott dropping a 1.32-kg (2.91-pound) aluminum geological...
Video: NASA
Learn about Subrahmanyan Chandrasekhar's elucidation in understanding black holes
An overview of Subrahmanyan Chandrasekhar's contribution to the understanding of...
Video: © Open University (A Britannica Publishing Partner)
Understand how the Earth remain stable in orbit around the sun
How Earth is able to remain in orbit by balancing speed and gravitational pull from...
Video: © MinutePhysics (A Britannica Publishing Partner)
Learn about space expansion and why gravity and electromagnetism are not affected when space expands
A brief overview of space expansion.
Video: © MinutePhysics (A Britannica Publishing Partner)
Discover how the solar system, which started as a shapeless spherical blob ended up being flat
Learn how the solar system, which formed from a roughly spherical cloud, became flat.
Video: © MinutePhysics (A Britannica Publishing Partner)
Buoyancy, gravity, density, and water displacement explained
Learn what determines whether an object in water will float or sink.
Video: Encyclopædia Britannica, Inc.
Know about the common misconceptions in physics like how gravity affects light, the shape of the earth, and measuring velocity in special relativity
Learn about common physics misconceptions such as how light is affected by gravity...
Video: © MinutePhysics (A Britannica Publishing Partner)
How do satellites help measure sea levels?
Learn how sea level is measured.
Video: Contunico © ZDF Studios GmbH, Mainz
Know about the force of gravity which gives stones their shape
Learn how gravity dictates the shapes of stones.
Video: © MinutePhysics (A Britannica Publishing Partner)
Observe an experiment demonstrating which is faster over 10 meters by comparing the fastest sprinter in the world with a falling object
An experiment to demonstrate which is faster over 10 metres: the fastest sprinter...
Video: © MinutePhysics (A Britannica Publishing Partner)
What are gravitational waves and how were they first detected?
Learn about gravitational waves and how scientists in 2015 first directly detected...
Video: Courtesy of Northwestern University (A Britannica Publishing Partner)
View German pilot Norbert Biehler inside a human centrifuge training to withstand an accelerated centrifugal force
Watch a German air force pilot training to withstand the stresses of flight in a...
Video: Contunico © ZDF Studios GmbH, Mainz
Learn about the dark matter and its gravitational effects
A brief lesson on the gravitational effects of dark matter.
Video: © MinutePhysics (A Britannica Publishing Partner)
Experience a parabolic flight with scientists exploring how time spent in space affects an astronaut's health
Scientists studying the effects of weightlessness on astronauts.
Video: Contunico © ZDF Studios GmbH, Mainz
Discover how astronauts mimic space's microgravity on Earth with a special plane and a ballistic flight path
Various aspects of life in microgravity and how it is simulated on Earth.
Video: Encyclopædia Britannica, Inc.
See experiments describing gravity and why zero gravity or weightlessness influence the Earth
Overview of gravity, with a focus on zero gravity.
Video: Contunico © ZDF Studios GmbH, Mainz; Thumbnail © Joggie Botma/Dreamstime.com
Know about the discovery of gravitational waves and their role in unlocking secrets of the universe
An overview of gravitational waves, including the announcement of their discovery.
Video: © Behind the News (A Britannica Publishing Partner)
Consider how Isaac Newton's discovery of gravity led to a better understanding of planetary motion
Isaac Newton's formulation of the law of universal gravitation.
Video: Encyclopædia Britannica, Inc.

Images

gravitational lens
In this picture a galactic cluster, about five billion light-years away, produces...
Photo AURA/STScI/NASA/JPL (NASA photo # STScI-PRC96-10)
effects of gravity on the Moon and Earth
Effects of gravity on Earth and the Moon.
Encyclopædia Britannica, Inc.
gravitational force
Earth's gravitational force weakens with increasing distance.
Encyclopædia Britannica, Inc.
variation in Earth's gravitational field
The variation in the gravitational field, given in milliGals (mGal), over the Earth's...
Encyclopædia Britannica, Inc.
experimental evidence for general relativity
In 1919 observation of a solar eclipse confirmed Einstein's prediction that light...
Encyclopædia Britannica, Inc.
Laser Interferometer Space Antenna (LISA)
Laser Interferometer Space Antenna (LISA), a Beyond Einstein Great Observatory,...
Encyclopædia Britannica, Inc.
black hole in M87
Black hole at the centre of the massive galaxy M87, about 55 million light-years...
Event Horizon Telescope collaboration et al.
gravity versus launch speed
The launch speed required for a spacecraft to escape Earth's gravitational pull differs...
Encyclopædia Britannica, Inc.
how the Sun and Moon cause tides
Tides are caused by the gravitational pull of the Sun and the Moon on Earth's water....
Encyclopædia Britannica, Inc.
gravity map of Earth's oceans
Gravity map of Earth's ocean surface, computed from radar-altimetry measurements...
D.T. Sandwell from Scripps Institution of Oceanography, W.H.F. Smith from National Oceanic and Atmospheric Administration/National Ocean Service/Office of Ocean & Earth Science/Geoscience Lab
Moon: gravity map
Gravity maps of the Moon, showing near and far sides, based on Lunar Prospector data.
NASA
force in Earth-Sun system
Figure 9: The gravitational force FG...
Encyclopædia Britannica, Inc.
variation of gravitational acceleration
Figure 3: Variation of gravitational acceleration across a finite-sized body leading...
Encyclopædia Britannica, Inc.
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