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Earth rotates on its axis counterclockwise (northern hemisphere) Earth rotates from west to east. This is why we see the Sun rise from the east and set to the west.

Earth movements: 2. Earth tilt 23.5 degree Let's learn what is altitude and why we have seasons.

Let's look at Mars' TWO moons, Phobos and Deimos. We will look at the crater names of Phobos and Deimos, as well as 3D,,, and Gulliver,,, Laputa,,, Lagado,,, Swift,,,

Physical Property of Minerals.

Five Criteria to define a mineral. Here you see minerals.

Moh scale for mineral's hardness 1-10

The 4th planet from the Sun, MARS. Let's find out the Mars surface names with Mars exploration. Mars exploration in 2021 is Perseverance. Surely, there are more Martian explorations not shown here.

1 Light Year (LY) = the distance that light travels for one year. 1 LP = 10 trillion km. The speed of light = 300,000 km/sec

How to convert the temperature degree from Fahrenheit to Celsius? or vice versa. What is temperature Kelvin? We learn how the conversion works.

Let's estimate the Earth's rotation speeds at different latituds.

Doppler Effect 2, Expanding Universe, and the Big Bang Theory

What is the Doppler effect? Red-shifted = moving away from You Blue-shifted = moving toward to You

Moon 月の海の名前について調べましょう English ruclips.net/video/vymsFDUQWBM/видео.html 한국어 ruclips.net/video/D6fPV5IfvHs/видео.html 日本語　ruclips.net/video/3Cpt1l8cqWc/видео.html

달의 바다라고 불리는 곳들의 이름에 대해 알아봅시다. English ruclips.net/video/vymsFDUQWBM/видео.html 한국어 ruclips.net/video/D6fPV5IfvHs/видео.html 日本語　ruclips.net/video/3Cpt1l8cqWc/видео.html

Moon : Mare names, crater names, Apollo locations