celestial objects articles
What astronomical path is the zodiac band centered upon?
Which celestial bodies are primarily mentioned as passing through the zodiacal band?
Who is credited with dividing the ecliptic into twelve equal arcs?
What is the approximate angular width, north and south of the ecliptic, that defines the zodiac band?
What phenomenon causes the dates associated with astrological signs to shift relative to the actual constellations?
How many constellations does the Sun actually pass through along the ecliptic path?
Which constellation interrupts the traditional sequence of the twelve astrological signs along the Sun's path?
How does the size of the actual constellation Virgo compare to Scorpio, based on the text?
What was the original basis for the sequence order of the twelve astrological signs?
Due to precession, how far out of sync are the astrological dates relative to the actual constellation alignment?
What measurement defines the divisions of the ecliptic established by the Babylonians for astrology?
What was Charles Messier's primary passion that drove his observation efforts?
What was the main incentive for Messier's dedicated pursuit of comet discoveries?
During which historical era did Charles Messier live and work?
In what year was the initial Messier Catalog list first published, and how many objects did it contain then?
What is the total, generally accepted final count of objects included in the Messier Catalog?
Which individual is credited with discovering many of the later entries added to the Messier Catalog?
What object was M1, the first catalog entry, and what event prompted Messier's discovery of it?
What are the three main categories of deep-sky objects found in the Messier Catalog?
What famous galaxy is designated as M31 in the Messier Catalog?
What was the immediate, practical reason Messier began compiling the list of fuzzy, non-moving patches?
What is the primary tool astronomers use to gauge the distance to distant cosmic sources?
What physically defines a redshift ($z$)?
How is the mathematical definition of redshift ($z$) calculated?
What are the three primary causes listed for the stretching or shifting of light?
What fundamentally causes the cosmological redshift observed in distant galaxies?
What does a greater measured redshift ($z$) directly correlate with for an observed object?
What relationship does Hubble’s Law formalize for relatively nearby galaxies?
What physical quantity does the proportionality constant, $H_0$, in Hubble’s Law represent?
For small redshifts ($z ext{ less than 1}$), how is the recession velocity ($v$) approximated?
Why does the simple linear form of Hubble’s Law fail for high-redshift objects?
What is required to accurately determine the physical distance to an object with a very high redshift ($z$)?