Which of the following is a reason that astronomers have not found giant planets with the orbit of Neptune around other stars? O our theories suggest that orbits as far away from a star as Neptune are never stable (and the presence of Neptune in our own solar system is a big mystery) O the method we are using to find planets currently can only reveal low-mass planets, while we expect high-mass planets at the orbit of Neptune O we have already found several planets as far from their stars as Neptune is from the Sun O At the distance of Neptune's orbit, it takes 165 years to go around the Sun; getting information about just one cycle of such a planet's orbit around another star would take astronomers 165 years O at the orbit of Neptune, only very low-mass planets (smaller than Mercury) can form Q Search LO
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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