Quick Revision: The Solar System Video Lecture | Science for Year 4

0:0:0: everyone today we're going to explore
0:0:3: something really exciting the solar
0:0:5: system it's a big space family with the
0:0:8: sun planets and even space rocks let's
0:0:12: dive in and learn all about it the solar
0:0:16: system is made up of the Sun and
0:0:17: everything that orbits or moves around
0:0:20: it this includes the planets moons dwarf
0:0:24: planets and space rocks comets meteors
0:0:27: and
0:0:28: asteroids guess what what about 4.6
0:0:32: billion years ago there wasn't a solar
0:0:34: system like we see today it all started
0:0:38: with a big cloud of dust and gas
0:0:39: spinning around this Cloud formed the
0:0:42: sun and the bits and pieces around it
0:0:45: stuck together to make planets and space
0:0:48: rocks pretty cool right let us learn
0:0:52: about it in detail the sun is the center
0:0:55: of the solar system and is composed
0:0:57: mostly of hydrogen and helium it is the
0:1:0: source of the energy which makes life on
0:1:3: Earth possible the eight planets orbit
0:1:6: around the Sun in elliptical
0:1:8: orbits first up among the planets is
0:1:11: Mercury Mercury is the closest planet to
0:1:14: the
0:1:15: sun because it is so close to the Sun it
0:1:18: is very hot and Mercury during the
0:1:21: daytime the temperature can reach up to
0:1:24: 430° C
0:1:26: 86°
0:1:28: fah next is Venus the second planet from
0:1:31: the sun it is between Mercury and Earth
0:1:36: even though it is farther from the Sun
0:1:38: Venus gets hotter than Mercury during
0:1:40: the
0:1:41: daytime it becomes hot because it has a
0:1:44: thick and dense layer of gases
0:1:45: surrounding
0:1:47: it here we are at Earth our very own
0:1:50: Planet it's in the perfect spot not too
0:1:53: hot and not too cold it lies in what
0:1:56: scientists call The goldilock Zone which
0:1:59: means means it is at a distance that is
0:2:1: not too close or too far away from the
0:2:4: Sun the distance from Earth to the Sun
0:2:7: is one of the most important factors
0:2:9: that enable the planet to support life
0:2:13: After Earth we have Mars known for its
0:2:15: red dust and huge dust Stones Mars is
0:2:19: the fourth planet from the sun it is
0:2:21: between Earth and
0:2:23: Jupiter the atmosphere on Mars is quite
0:2:26: Dusty it's got a lot of wind that whips
0:2:29: up the dust into what are called dust
0:2:32: devils Mars is a fascinating place with
0:2:34: a lot of
0:2:36: mysteries moving on we meet Jupiter
0:2:39: Jupiter is the fifth planet from the
0:2:42: sun it is the biggest planet in the
0:2:45: solar system it is even bigger than all
0:2:48: the other planets put together it has a
0:2:51: small rocky Co the rest of it is made of
0:2:54: liquid and gas
0:2:56: clouds next is Saturn famous for its be
0:2:59: beautiful Rings Saturn is the sixth
0:3:2: planet from the
0:3:4: sun like Jupiter it also has a small
0:3:7: rocky Co the rest of it is also made of
0:3:11: liquid and gas clouds it is smaller than
0:3:14: Jupiter but it is still a big planet it
0:3:17: is more than 700 times the size of Earth
0:3:21: then we have Uranus a cold blue green
0:3:25: planet Uranus is the seventh planet from
0:3:28: the sun it is a freezing cold planet
0:3:31: with a Rocky and icy core its mantle or
0:3:34: middle layer is composed of molten iron
0:3:38: the outermost layer is an atmosphere of
0:3:41: methane which makes Uranus appear blue
0:3:43: green in
0:3:45: color last of the planets is Neptune way
0:3:48: out there and far from the sun it's
0:3:51: known for being the most distant planet
0:3:53: in our solar system Beyond Neptune
0:3:57: there's a whole bunch of smaller objects
0:3:59: like DW half planets and
0:4:2: comets asteroids are big rocks that move
0:4:5: around the Sun they're covered in dust
0:4:8: and have lots of craters from bumping
0:4:10: into other space stuff they're like the
0:4:13: solar systems Old Rocky
0:4:16: friends comets are icy Dusty rocks with
0:4:19: long tails when they get close to the
0:4:22: Sun they warm up and the ice turns into
0:4:25: gas making a bright tail that we can see
0:4:27: from Earth meteors are pieces of rock
0:4:30: from space that burn up when they hit
0:4:32: the Earth's
0:4:34: atmosphere they make bright streaks in
0:4:36: the sky like shooting stars it's really
0:4:40: fun to watch them now let's talk about
0:4:43: Earth it didn't always look the way it
0:4:46: does now scientists believe that the
0:4:49: Earth was born as a huge ball of hot and
0:4:52: burning gases it kept on
0:4:55: spinning as it spun its outer surface
0:4:58: became cool and hard
0:5:0: the outer surface of the Earth is hard
0:5:2: but its interior is hot and
0:5:4: molten the Earth's crust has three
0:5:7: layers crust mantle and
0:5:10: coold Earth does two main
0:5:13: moves it spins around which is called
0:5:16: rotation this is why we have day and
0:5:19: night it also travels around the sun
0:5:22: which is called
0:5:24: Revolution this takes about 365 days and
0:5:28: gives us our seasons
0:5:31: rotation the Earth rotates on its own
0:5:33: axis from west to east axis is an
0:5:37: imaginary line running from the North
0:5:39: Pole to the South Pole the Earth's axis
0:5:42: is tilted at an angle of
0:5:45: 23.5° the rotation of the Earth causes
0:5:48: day and night one half facing the sun is
0:5:51: lit while the other is dark different
0:5:54: countries have different times
0:5:56: simultaneously due to Earth's rotation a
0:5:59: America is on the opposite side of India
0:6:2: when it is Day in India in America it is
0:6:5: night
0:6:6: Revolution the earth goes around the Sun
0:6:9: in its own orbit this is called
0:6:12: Revolution it takes
0:6:15: 3651 by 4 days to complete one
0:6:18: revolution this duration is called a
0:6:21: solar year the revolution of the Earth
0:6:24: around the Sun causes
0:6:25: seasons the reason we have different
0:6:28: seasons is because of Earth tilt and its
0:6:30: revolution around the Sun When the
0:6:33: Northern Hemisphere gets more sunlight
0:6:35: it's summer there and winter in the
0:6:37: southern
0:6:38: hemisphere then it switches after 6
0:6:45: months another imaginary line called
0:6:48: equator divides the earth into two equal
0:6:51: halves Northern Hemisphere and southern
0:6:53: hemisphere the Tilted Earth's axis
0:6:56: causes the North Pole to face the Sun
0:6:58: during Northern hem face summer leading
0:7:0: to continuous
0:7:2: Sunshine simultaneously the South Pole
0:7:5: experiences continuous
0:7:7: Darkness this results in 6 months of
0:7:10: daylight and 6 months of nighttime at
0:7:12: the polls each year thanks for exploring
0:7:16: the solar system with me today remember
0:7:19: space is an amazing place with so much
0:7:21: to learn and discover see you next time
0:7:25: for more
0:7:27: Adventures we hope that you have
0:7:29: understood to the topic you can now
0:7:31: study chapter notes watch video lectures
0:7:34: and solve McQ tests of this chapter on
0:7:37: adff to ensure you score well in your
0:7:39: school
0:7:40: exams and that's not all you also get
0:7:43: amazing courses for maths science
0:7:46: English Hindi and much more for class 4
0:7:50: thank you