The apparent size of Earth when observed from far away would depend on the specific distance at which it is viewed. However, to provide a general comparison, let's consider the angular diameter of Earth as seen from different distances, and compare it to the angular diameter of Jupiter and Saturn.
The average diameter of Earth is about 12,742 kilometers (7,918 miles), while Jupiter has a diameter of about 143,000 kilometers (88,900 miles), and Saturn has a diameter of about 120,500 kilometers (74,900 miles).
Now, let's assume we are observing Earth, Jupiter, and Saturn from a distance of 100 million kilometers (about 62 million miles).
The angular diameter of an object can be calculated using the formula:
Angular Diameter = (Actual Diameter) / (Distance to the Object)
For Earth:
Angular Diameter of Earth = (12,742 km) / (100,000,000 km) ≈ 0.00012742 radians
For Jupiter:
Angular Diameter of Jupiter = (143,000 km) / (100,000,000 km) ≈ 0.00143 radians
For Saturn:
Angular Diameter of Saturn = (120,500 km) / (100,000,000 km) ≈ 0.001205 radians
From this calculation, we can see that when observed from the given distance, Earth would appear smaller than both Jupiter and Saturn. In fact, it would be roughly an order of magnitude smaller in angular size compared to Jupiter and Saturn.
Keep in mind that these calculations are approximate and can vary depending on the distance chosen for observation. Additionally, the sizes of Jupiter and Saturn mentioned here are their equatorial diameters. The observed size may also vary due to factors like the inclination of the planet's rings or the angle of observation.