Physics

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1. physics

   Star A is four times as far away as star B, but they have the same luminosity. Which appears brighter from Earth. and by how much?

2. science help PLS

   When nuclear fusion begins, what can be said about the internal processes within that star? Atoms in the star begin to split. Atoms in the star begin to combine. The star is turned into a nebula. The star is turned into a blue

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   Radio and TV transmissions are being emit- ted into space, so Star Trek episodes are streaming out into the universe. The near- est star is 2 × 1017 m meters away. If civilized life exists on a planet near this star, how long

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   Assume that the mass of a neutron star is 1.5 times that of the Sun and the radius of the neutron star is 10 km. Ignore effects of Special Relativity. What is the approximate speed at which an object released from far away (at

1. science help

   An astronomer sees two stars in the sky. Both stars are equally far from Earth, but the first star is brighter than the second star. Which of the following is a valid conclusion about the first star? It is larger than the second

2. Physics

   A star with the same mass and diameter as the sun rotates about a central axis with a period of about 29.2 days. Suppose that the sun runs out of nuclear fuel and collapses to form a white dwarf star with a diameter equal to that

3. Science

   In general, the narrower the spectral line of a star A.the hotter the star is B.the bigger the star is C.the denser the star is D.the smaller that star is E.the cooler the star is

4. science

   Using various telescopes, astronomers discovered a giant star that is 100 times larger than the Sun, and is very hot. It is blue-white in color. Why does the Sun appear brighter than this larger star when viewed from Earth? - The

1. Astronomy

   1. When comparing the sizes of stars, our Sun is: a.) the largest star discovered to date b.)one of the larger stars discovered to date c.)medium size as compared to other stars d.)one of the smallest stars discovered to date My

2. Calculus 1

   A variable star is one whose brightness alternately increases and decreases. For one such star, the time between periods of maximum brightness is 4.7 days, the average brightness (or magnitude) of the star is 5.3, and its

3. SCIENCE HELP PLEEASE

   Given the following images, choose the one that most likely represents an O-class star. Star A is a yellow star. Star B is a blue star. Star C is a red star. Star D is a green star. A B C D is it b

4. Astronomy

   1. What color are stars that are very hot and very bright? A. Red B. Blue C. White D. Yellow 2. During the contraction of a protostar, density increases and ______ rises. A. Nuclear energy B. Dust C. Temperature D. Outflow 3. What

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