Space probes don't need air, water, food, sanitary facilities, or tightly controlled limits of
temperature, acceleration, and exposure to radiation.
They also don't need to be returned to earth.
As of now, the only planet known to have its own moon is Earth. Other planets in our solar system have moons but no planets of their own. In our solar system, moons primarily orbit around planets rather than planets orbiting around other planets.
Io and Titan are moons because they orbit planets (Jupiter and Saturn respectively).
Johannes Kepler.
I'm not sure what you mean by "Star planets." However, I can tell you that there are 8 known planets that orbit the star Sol, including Earth (Sol 3).
No, not yet at least. The only object that astronauts have been to other than Earth is the moon, which is a moon rather than a planet. There other planets are much farther away, but there are some plans to land people on Mars.
Moons orbit planets Or rather moons and planets orbit their barycenter.
It is generally cheaper to fly on weekdays, such as Tuesday or Wednesday, rather than on weekends.
Always cheaper to switch it off and on rather than leaving it on.
As with many products it is generally cheaper to buy HP ink in bulk rather than individually. How much cheaper depends on the store the ink is bought at, the amount and the colour variations.
No it is not cheaper once you factor in the shipping. It would be cheaper for you to get the items in person at a grocery rather than pay the shipping charge.
to make it look cheaper to make it look cheaper
coal was in abundance and was very cheap thus the running of the trains was cheaper
So the penny is history but I am wondering how is it cheaper to use the nickel 5 cent piece?
Yes, it is often cheaper to pay for checked bags online in advance rather than at the airport.
As of now, the only planet known to have its own moon is Earth. Other planets in our solar system have moons but no planets of their own. In our solar system, moons primarily orbit around planets rather than planets orbiting around other planets.
The design, development, assembly, and pre-launch test of every space probe was the work of literally thousands of people. No space probe was ever invented by a single individual.
For Astrology rather than Astronomy.