Question

1. do jovian or terrestrial planets have a greater density? 15. what is the luminosity and temperature of the star spica? k 16. which other star has the closest luminosity and temperature to our sun? 17. which stage of a star’s life are the majority of all stars currently in? 18. what is the next life cycle stage that our sun will transition to? 19. as the temperature of main sequence stars decreases, their luminosity 20. name 2 stars in the late, dim stage of their life cycle. vocabulary: observation - the act of using the 5 senses to gather information inference - an educated guess about something based on observations big bang theory - the cosmic explosion that marked the origin of the universe 13.8 billion years ago doppler effect - change in the apparent frequency of a wave as observer and source move toward or away from each other a star moving away from us has a red shift and a star moving toward us has a blue shift. (red or blue) spectra - h - r diagram - shows the relationship between absolute magnitude, luminosity, stellar classification, and surface temp absolute magnitude - the true brightness of star. (depends on amount of nuclear fusion) apparent magnitude - how bright a star appears to an observer terrestrial - the four planets closest to the sun with similar size and density, with a compact, rocky surface jovian - the four outer planets with large masses that are gaseous in nature oblate spheroid - having an equatorial diameter greater than the polar zenith - the point in the sky an are celestial sphere directly above an observer

Explanation:

1. Spica is a B - type main - sequence star. It has a luminosity of about 26000 times that of the Sun and a surface temperature of around 22400 K.
2. Alpha Centauri A is relatively close to the Sun in terms of luminosity and temperature among well - known stars.
3. The majority of stars are in the main - sequence stage, where they generate energy through hydrogen fusion in their cores.
4. The Sun will next transition to the red - giant stage when it runs out of hydrogen in its core and starts fusing helium.
5. For main - sequence stars, as the temperature decreases, their luminosity also decreases. This is due to the relationship between a star's temperature, size, and luminosity as described by the Stefan - Boltzmann law and the mass - luminosity relationship.
6. White dwarfs are in the late, dim stage of their life cycle. Examples include Sirius B and Procyon B.

Answer:

1. Luminosity: about 26000 times that of the Sun; Temperature: around 22400 K
2. Alpha Centauri A
3. Main - sequence stage
4. Red - giant stage
5. Decreases
6. Sirius B, Procyon B