The spectrum of a typical star shows absorption lines at different wavelengths than their laboratory values. If the observed wavelength is less than its laboratory value of 656.3 nm, one can conclude that...   A. The separation between Earth and the star is decreasing.   B. The separation between Earth and the star is increasing.   C. The separation between Earth and the star is unchanging   D. No conclusion is possible

5. The Luyten 762-8 star system contains two stars, one with apparent 12.5 and the other with m = 12.9. What is the combined magnitude m = apparent magnitude of the two stars?

1. If the maximum wavelength in the sun spectrum Amax =480 nm and a = 2.89x103 K.m calculate the sun surface temperature

State whether it is true that “the A spectrum is AM0 and the B spectrum is AM1.5”. Explain why B is weaker than A across the whole wavelength range. Show how you estimate the surface temperature of the Sun using the given spectrum.

The Sun appears to be yellow when overhead because:1. The human eye is most sensitive to yellow. 2. Yellow frequencies are transmitted better through the atmosphere. 3. Air does not absorb yellow frequencies. 4. The temperature of the Sun is 6000 K. 5. More than one of the above. 6. None of the above.

16 Which of the following methods has led to the most discoveries of massive planets orbiting near their parent stars? (A) Detecting the shift of the star's position against the sky due to the planet's gravitational pull B Detecting the starlight reflected off the planet C Detecting a planet ejected from a binary star system D Detecting the infrared light emitted by the planet E Detecting the gravitational effect of an orbiting planet by looking for the Doppler shifts in the star's spectrum

Help with 7

3. Consider the following stellar spectra from the sun and from a supercluster of galaxies. ABSORPTION LINES FROM THE SUN ABSORPTION LINES FROMA SUPERCLUSTER OF GALAXIES BAS11 v = 0.07c, d 1 billion light years (a) Describe the movement of the stars in the supercluster relative to the sun. (b) Suppose the absorption lines on the bottom spectrum had varying thickness. What would this indicate about the stars in the supercluster?

Physics astronomy

1. Spectral signatures can be described using luminosity values in different spectral regions. UV Blue Green Red NIR Forest 28 29 36 27 56 Water 22 23 19 13 8 Corn 53 58 59 60 71 Pasture 40 39 42 32 62 Assuming these signatures are influenced by atmospheric effects: is it possible to separate the different categories based on the values in this table? Which band (s) are the most useful for distinguishing between the different classes in this table and why?