sted below are the names, spectral types (in parentheses), and approximate masses of several nearby main-sequence stars. Rank th
e stars based on the distances to their habitable zones (from the central star), from shortest to longest.
1 answer:
Answer:
<em>From shortest distance to longest distance:</em>
<em>Barnard's Star (M4) </em>
<em>61 Cygnia A (K5) </em>
<em>Alpha Centauri A (G2) </em>
<em>Sirius (A1) </em>
<em>Spica (B1)</em>
Explanation:
A <em>habitable zone</em> is the range of orbits around a star within which a planetary surface can support liquid water given sufficient atmospheric pressure. In the image, the green zone is the habitable zone, that is why <em>Barnard's Star (M4)</em> is first in the list and <em>Spica (B1)</em> is last in the list.
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1 feet
Explanation:
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Answer: (x - 4)² + (y - 7)² = 9
<u>Explanation:</u>
The equation of a circle is: (x - h)² + (y - k)² = r² where
- (h, k) is the center
- r is the radius
Given: (h, k) = (4, 7)
Find the intersection of the given equation and the perpendicular passing through (4, 7).
3x - 4y = -1
-4y = -3x - 1
-->
Use substitution to find the point of intersection:
Use the distance formula to find the distance from (4, 7) to (5.8, 4.6) = radius
Input h = 4, k = 7, and r = 3 into the circle equation:
(x - 4)² + (y - 7)² = 3²
(x - 4)² + (y - 7)² = 9
