If we had No Moon - P2

The Moon is Earth's only natural satellite and is the fifth largest satellite in the Solar System. It is the largest natural satellite in the Solar System relative to the size of its planet, a quarter the diameter of Earth and 1/81 its mass, and is the second densest satellite after Io. It is in synchronous rotation with Earth, always showing the same face; the near side is marked with dark volcanic maria among the bright ancient crustal highlands and prominent impact craters. Despite being the brightest object in the sky after the Sun, its surface is actually very dark, with a similar reflectance to coal. Its prominence in the sky and its regular cycle of phases have since ancient times made the Moon an important cultural influence on language, the calendar, art and mythology. The Moon's gravitational influence produces the ocean tides and the minute lengthening of the day. The Moon's current orbital distance, about thirty times the diameter of the Earth, causes it to be the same size in the sky as the Sun allowing the Moon to cover the Sun precisely in total solar eclipses.
The Moon is the only celestial body on which humans have made a manned landing. While the Soviet Union's Luna programme was the first to reach the Moon with unmanned spacecraft, the United States' NASA Apollo program achieved the only manned missions to date, beginning with the first manned lunar orbiting mission by Apollo 8 in 1968, and six manned lunar landings between 1969 and 1972 the first being Apollo 11 in 1969. These missions returned over 380 kg of lunar rocks, which have been used to develop a detailed geological understanding of the Moon's origins (it is thought to have formed some 4.5 billion years ago in a giant impact), the formation of its internal structure, and its subsequent history.

Moon
Orbital characteristics
Perigee 363,104 km (0.0024 AU)
Apogee 405,696 km (0.0027 AU)
Semi-major axis 384,399 km (0.00257 AU)
Eccentricity 0.0549
Orbital period 27.321582 d (27 d 7 h 43.1 min)
Synodic period 29.530589 d (29 d 12 h 44 min 2.9 s)
Average orbital speed 1.022 km/s
Inclination 5.145° to the ecliptic
(between 18.29° and 28.58° to Earth's equator)
Longitude of ascending node regressing by one revolution in 18.6 years
Argument of perigee progressing by one revolution in 8.85 years
Satellite of Earth
Physical characteristics
Mean radius 1,737.10 km (0.273 Earths)
Equatorial radius 1,738.14 km (0.273 Earths)
Polar radius 1,735.97 km (0.273 Earths)
Flattening 0.00125
Circumference 10,921 km (equatorial)
Surface area 3.793 × 107 km2 (0.074 Earths)
Volume 2.1958 × 1010 km3 (0.020 Earths)
Mass 7.3477 × 1022 kg (0.0123 Earths)
Mean density 3,346.4 kg/m3
Equatorial surface gravity 1.622 m/s2 (0.165 4 g)
Escape velocity 2.38 km/s
Sidereal rotation
period 27.321582 d (synchronous)
Equatorial rotation velocity 4.627 m/s
Axial tilt 1.5424° (to ecliptic), 6.687° (to orbit plane)
Albedo 0.136
Surface temp. min mean max
equator 100 K 220 K 390 K
85°N 70 K 130 K 230 K
Apparent magnitude −2.5 to −12.9
−12.74 (mean full Moon)
Angular diameter 29.3 to 34.1 arcminutes
Atmosphere
Surface pressure 10−7 Pa (day)
10−10 Pa (night)
Composition Ar, He, Na, K, H, Rn

Category:

Science & Technology

Tags:

• Sunrise on the Moon
• Sunset on the Moon
• The Moon
• Moon Lunar Libration
• Lunar Phases
• Lunar Farside
• the faces of the moon
• lunar rotation
• the Moon
• moon
• Earth
• solar system
• lunar months
• sidereal month
• kurdistan planetarium
• kurd
• kurdistan

[niscape97]

If the earth was hit by another planet, wouldn't that change earth's orbit around the sun?

[KurdstanPlanetarium]

@niscape97 yes you are right, it does (though not much), its what we have Earth new oribt, for sure the early Earth orbit was somehow different..remember there were more planets in early days of the Solar System, and out of collision of those 100 planets or so, we have 9 planets left and the rest of the memembers of the solar system..

[qwyzl]

i had heard the days and years used to be LONGER, not shorter. so which is it?

[KurdstanPlanetarium]

@qwyzl no days used to be shorter and now getting longer,

thats by one houre every 200 million years, so the time when the Dinosaurs just emerged days used to be 23 hours . that is the result of tidal forces that slows down Earth diurnal rotation, (you can watch my other video: Earth Rotaion slowing down)

as for years, things wont change so dramatic as the orbit is pretty same as in past !!

[qwyzl]

@KurdstanPlanetarium i had seen some documentary a long time ago where scientists claimed the year used to be some thing like 400 days long and that there was an extra hour in the day. also, i remember seeing some program where some woman lived in a cave for a while and her body adjusted it self to a 25 hour cycle in stead of a 24 hour day. remember, she was in total darkness. but it does make more sense that the days and years used to be faster.

[KurdstanPlanetarium]

@qwyzl Days as I said, that has been slowed down by a factor of 1 hours evey 200 million years, have you looked at my other video (Earth Rotation Slowing down), it explains all.

as what governs a year is the orbital distance from the sun, and that can be calculated by Keplers planetary laws, I doubt that the distance of Earth from the sun has changed since it occupied its current position, but since days were shorter, so a year yes must ve been loneger based on those hourly days peroids.

[KurdstanPlanetarium]

@KurdstanPlanetarium to continue: let's do a calculations for a year when days used to be 20 hours that was 800 million years.

a year now is 365.5 days but that based on 24 hours

since orbital peroid always same for same orbital distance the sun, so :

365.5 x 24 = 8772 hours at present

800 million years ago days use to be 20 hours so:

8772 / 20 = 438.6 days based on 20 hourly days

so 800 million years ago a year was 438.6 days but based on the 20 hourly days



[ControlWise]

This is awesome! Please post more parts! I can't believe Patrick Stewart is narrating this.

[TheRubberMatch]

what will happen when the moon strays too far from the earth?

[N1k02730]

@Agarzilla i've seen the same comment on 10 other moon videos, stop being such a retarded copycat plz, tyvm.

[5OMGWTFBBQ]

if our moon or as i say the extra planet would have collided at an angle on the edge and been have destroyed and reformed it to our moon caught orbit and boom we has moon

[Akhenaten2011]

@DeeWeext Yeah it's Patrick Stewart

[Akhenaten2011]

I guess "Q" was right, I shouldn't have not played football so close to Uranus and Saturn -.- Lol

[helljumpr5150]

Hmm, a planetary system of rings would've been nice...

[Thiefenz]

@KurdstanPlanetarium I wonder if that's why people seem to be getting taller as generations go on

[TheTruthWSYF]

"A double whammy." 6:25