Activity 1: ASTRONOMY IN THE NAKED EYE Directions: Read carefully and analyze each statement. If the underlined word/phrase in each sentence is correct write TRUE. If the word/phrase is incorrect, WRITE THE CORRECT WORD/PHRASE to make the sentence correct. 1. Tycho Brahe gave an accurate measurements of stellar objects and planets before the telescope was even invented. 2. Johannes Kepler discovered a forming new star then published a book which aims to debunk the Aristotelian doctrine of celestial realm. 3. Tycho Brahe proposed the planetary model called heliocentric theory. 4. Johannes Kepler used the observations and data of Johannes Kepler to formulate the three laws of motion. 5. Tycho Brahe observed that the orbital path of Mars was elliptical, contrary to the previous astronomers who were trying to fit the planetary paths in circles. 6. According to the law of ellipse formulated by Johannes Kepler, the line joining a planet and the Sun sweeps out equal areas in space in equal intervals of time. 7. The law of harmony explains that the larger the orbit size of a planet the longer it takes to orbit the sun. _8. The orbits of all the planets are circular with the Sun at one focus of the circle. _9. The orbit period of planets is measured in terms of astronomical units or AU. 10. Ptolemy provided the mathematical explanations of the observations of Tycho Brahe.
Stellar evolution
We may see thousands of stars in the dark sky. Our universe consists of billions of stars. Stars may appear tiny to us but they are huge balls of gasses. Sun is a star of average size. Some stars are even a thousand times larger than the sun. The stars do not exist forever they have a certain lifetime. The life span of the sun is about 10 billion years. The star undergoes various changes during its lifetime, this process is called stellar evolution. The structure of the sun-like star is shown below.
Red Shift
It is an astronomical phenomenon. In this phenomenon, increase in wavelength with corresponding decrease in photon energy and frequency of radiation of light. It is the displacement of spectrum of any kind of astronomical object to the longer wavelengths (red) side.
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