A planet is an astronomical body orbiting a star or stellar remnant that The term "planet" is ancient, with ties to history, astrology, science, mythology, and religion. Several planets in the Solar System can be seen with the naked eye. These were regarded by many early cultures as divine, or as emissaries of deities. As scientific knowledge advanced, human perception of the planets changed, incorporating a number of disparate objects. In 2006, the International Astronomical Union (IAU) officially adopted a resolution defining planets within the Solar System. This definition is controversial because it excludes many objects of planetary mass based on where or what they orbit. Although eight of the planetary bodies discovered before 1950 remain "planets" under the modern definition, some celestial bodies, such as Ceres, Pallas, Juno and Vesta (each an object in the solar asteroid belt), and Pluto (the first trans-Neptunian object discovered), that were once considered planets by the scientific community, are no longer viewed as such.

The planets were thought by Ptolemy to orbit Earth in deferent and epicycle motions. Although the idea that the planets orbited the Sun had been suggested many times, it was not until the 17th century that this view was supported by evidence from the first telescopic astronomical observations, performed by Galileo Galilei. At about the same time, by careful analysis of pre-telescopic observation data collected by Tycho Brahe, Johannes Kepler found the planets' orbits were not circular but elliptical. As observational tools improved, astronomers saw that, like Earth, the planets rotated around tilted axes, and some shared such features as ice caps and seasons. Since the dawn of the Space Age, close observation by space probes has found that Earth and the other planets share characteristics such as volcanism, hurricanes, tectonics, and even hydrology.

Answer this series of questions:

1. Is the term planet new?
2. Who thought planets orbited the Earth?
3. In what type of motions?
4. Was there another idea that had been suggested before?
5. Once or many times?
6. Did that idea say the Earth orbited a black hole?
7. What, then?
8. When was that view supported by some actual evidence?
9. What type of observations was the evidence from?
10. Who obtained the evidence?
11. Was anyone else making analysis at the same time?
12. Who?
13. Who collected the data Kepler was looking at?
14. Did he find that the planets' orbits were circular?
15. What type of orbits did they have, then?
16. What type of axis do planets rotate around?
17. Do many planets share features with the Earth?
18. What's an example of one?
19. When was a resolution adopted defining planets within the solar system?
20. By who?

Numbered answers:
1. No
2. Ptolemy
3. deferent and epicycle motions
4. Yes
5. many times
6. No.
7. That the planets orbited the sun
8. 17th century
9. telescopic astronomical observations
10. Galileo Galilei
11. Yes
12. Johannes Kepler
13. Tycho Brahe
14. No.
15. elliptical
16. tilted
17. Yes.
18. Volcanism
19. 2006
20. International Astronomical Union