One Astronomical unit is equal to how much Km in whole numbers
Nearest galaxy to our milky way is ________
Approximate age of milky_way is ________
Approximate age of earth is ________
Approximate age of moon is _________
Approximate age of sun is _________
Which gas was discovered on the sun about 151 years ago during total solar eclipse
In which layer of atmosphere does commercial aircrafts usually fly
Largest moon in our solar system is ________
The Percentage of Water used for Drinking in the world is