How heavy is the earth?
Earth has a mass of about 5.9722×10^24 kg.
Cool. How can the earth's mass be measured?
The Earth's mass can be measured using various methods, including:

1. Newton's Law of Gravitation: By measuring the gravitational force between the Earth and an object of known mass, the Earth's mass can be calculated using Newton's Law of Gravitation.
2. Satellite Orbit Analysis: By analyzing the orbit of an artificial satellite around the Earth, the Earth's mass can be calculated based on the gravitational force between the Earth and the satellite.
3. Lunar Motion Analysis: By analyzing the motion of the Moon around the Earth, the Earth's mass can be calculated based on the gravitational force between the Earth and the Moon.
4. Torsion Balance Experiments: In these experiments, a large mass is suspended from a wire, and the gravitational force between the large mass and the Earth is measured using a sensitive torsion balance. The Earth's mass can be calculated based on the measured gravitational force.