Astronomical observations of our Milky Way galaxy indicate that it has a mass of about 8 ✕ 1011 solar masses. A star orbiting near the galaxy's periphery is 5.8 ✕ 104 light years from its center. (a) What should the orbital period (in y) of that star be? y (b) If its period is 7.0 ✕ 107 y instead, what is the mass (in solar masses) of the galaxy? Such calculations are used to imply the existence of "dark matter" in the universe and have indicated, for example, the existence of very massive black holes at the centers of some galaxies. solar masse

Q: Astronomical observations of our Milky Way galaxy indicate that it has a mass of about 8.0 x 10…

A: (a) orbital period of the star T=2πr3GM=2π6.0×104 ly39.461×1015 m1 ly36.67×10-11…

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Q: Astronomical observations of our Milky Way galaxy indicate that it has a mass of about 8.0 x 10…

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A: Given: r = 7.77 x 108 m; (radius of orbit ) radius of exoplanet  is 2.97 x 107 m

Q: For the purposes of this problem, treat the Earth as a solid, uniform sphere with mass 5.97x1024 kg…

A: It is given that, M=5.97×1024 kgRe=6.37×106 mRo=1.5×1011 m

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Q: The mass of the Earth is 5.98 x 1024 kg, and the mass of the Moon is 7.36 x 1022 kg. The distance…

A: Given data: The mass of the Earth is ME=5.98×1024 kg. The mass of the Moon is MM=7.36×1022 kg. The…

Q: Astronomical observations of our Milky Way galaxy indicate that it has a mass of about 8.0 x 10…

A: mass of milky way (m) = 8×1011 solar masses = 8×1011×2×1030kg = 16×1041 kg distance (d) = 5.6×104…

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Q: Astronomical observations of our Milky Way galaxy indicate that it has a mass of about 8 ✕ 1011…

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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.