Astronomical Data

Gravity at surface of earth

9.81 m/s²

Radius of earth

6370 km

Period of rotation of earth

86400 s (= 1 day)

Mass of earth

6.0$\cdot$ 10²⁴ kg

Radius of moon's orbit around earth

384 400 km

Mass of moon

7.35$\cdot$ 10²² kg

Radius of moon

1735 km

Radius of earth's orbit around sun

1.48$\cdot$ 10¹¹ m

Period of earth's revolution around sun

3.156·10⁷ s

Mass of sun

2.0$\cdot$ 10³⁰ kg

Radius of our sun

7$\cdot$ 10⁸ m

Radius of our galaxy

3.7$\cdot$ 10²⁰ m

Mass of our galaxy

2.7$\cdot$ 10⁴¹ kg