Why is the Moon Drifting Away from Earth?

  • Context: Undergrad 
  • Thread starter Thread starter neildownonme
  • Start date Start date
  • Tags Tags
    Moon
Click For Summary
SUMMARY

The Moon is drifting away from Earth due to tidal friction, which is a result of the Earth's rotation being faster (24 hours) than the Moon's orbital period (28 days). This friction attempts to equalize these periods, slowing down Earth's rotation and pulling it backward, while simultaneously pulling the Moon forward and increasing its angular momentum. Consequently, the Moon's orbit is gradually expanding, leading to an increase in the distance between the two celestial bodies.

PREREQUISITES
  • Understanding of tidal friction and its effects on celestial bodies
  • Basic knowledge of angular momentum in astrophysics
  • Familiarity with the concepts of gravitational radiation
  • Knowledge of the Earth's rotation and orbital mechanics
NEXT STEPS
  • Research the effects of tidal forces on planetary bodies
  • Study the principles of angular momentum in astrophysics
  • Explore gravitational radiation and its implications in cosmology
  • Investigate the long-term effects of the Moon's recession on Earth
USEFUL FOR

Astronomy enthusiasts, astrophysicists, educators in planetary science, and anyone interested in the dynamics of celestial mechanics.

neildownonme
Messages
6
Reaction score
0
why is the moon drifting away from the earth? isn't it general relativity suggests that itll move towards the earth?
 
Physics news on Phys.org
If you are referring to gravitational radiation shrinking the orbit, the effect is pitifully small compared to the tidal effects which cause the moon to recede.
 
Tidal friction. The Earth's rotation is more rapid (24h) than the moon's orbital motion (28d). The friction of the tides tries to equalize these periods. It tends to slow the Earth down, pulling it backward and decreasing its angular momentum. Conversely the friction pulls the moon forward, increasing its angular momentum, thus causing the diameter of the orbit to increase.
 

Similar threads

Undergrad Gravity on the Moon vs. on the spinning Earth
  • · Replies 10 ·
Replies
10
Views
2K
Undergrad How can General Relativity explain the Moon drifting apart from Earth
  • · Replies 6 ·
Replies
6
Views
3K
High School A contradiction of the equivalence principle?
  • · Replies 99 ·
4
Replies
99
Views
6K
Undergrad Why is Rømer's light speed measurement not one-way?
  • · Replies 42 ·
2
Replies
42
Views
3K
High School Gravitational force of the Earth and Moon
  • · Replies 14 ·
Replies
14
Views
10K
High School Time dilation in a planet-moon system
  • · Replies 58 ·
2
Replies
58
Views
7K
Undergrad Question on the space shuttle Challenger experimentation, in 1985
  • · Replies 2 ·
Replies
2
Views
2K
Undergrad Analog TV reception in a spacecraft moving relative to the Earth
  • · Replies 9 ·
Replies
9
Views
2K
High School Moon time versus Earth time....
  • · Replies 6 ·
Replies
6
Views
3K
Undergrad Does Special and General Relativity Affect Aging of Apollo Astronauts?
  • · Replies 10 ·
Replies
10
Views
4K