Astronomyacademic

How long would it take to travel 7 trillion miles in space?

What type of star has a low temperature and a low luminosity?

What type of star has a high temperature but a low luminosity?

"Which stars have low temperatures and high luminosities? A. Red giants B. White dwarfs C. Main sequence stars"

What are the Sun's 7 layers in order, starting with the innermost core?

How does the interstellar medium affect our view of most of the galaxy? It prevents us from seeing most of the galactic disk with visible and ultraviolet light. It produces so much visible light that it blocks our view of anything beyond it. It has no effect on visible-light observations, but prevents us from studying the galactic center with radio waves or x -rays. It absorbs all wavelengths of light.

"Match each event with its description. A. Full moon: The moon is on the side of Earth opposite the sun. B. New moon: The moon is not visible to observers on Earth. C. Lunar eclipse: The moon is in Earth's shadow. D. Solar eclipse: The Earth is in the moon's shadow."

How bright is a magnitude +3.0 star compared to a magnitude +4.0 star? A. 4/3 (1.333) times brighter B. 10 times brighter C. 2.512 times brighter D. 1/2.512 times as bright

The compass direction points (N, NW, W, SW, S, SE, E, NE) are marked along the horizon in Starry Night. Change the direction you are facing until the gaze display shows an azimuth (Az) of 315 degrees. Toward what compass direction are you facing?

What causes the apparent retrograde motion of the planets?

The Andromeda Galaxy is located 2.5 million light-years away. How long does light take to travel from there to reach us?

Which of the eight planets has a smaller mass than Mercury? A. Earth B. Venus C. Jupiter D. Neptune E. Mercury has the smallest mass of the eight planets.

1 year on Neptune is equivalent to how many Earth years?

"Why is there a 4-minute difference between the solar day and the sidereal day? A. because the Earth's rotation is variable, due to the pull of the Moon B. because the stars slowly change their orientations in the Galaxy C. because the Earth is going around the Sun in the course of a year D. because the Earth's axis is tilted by about 23 degrees E. no one knows the reason; we just have to accept the difference as an unsolved mystery"

How many hours on Earth are equal to 1 hour in space?

The Hertzsprung-Russell diagram is used to show the relationship between which two characteristics of stars?

How many Earths can fit inside the Sun?

Write the number indicated in each statement in scientific notation. (a) A light-year, the distance that light travels in one year, is about 5,900,000,000,000 mi. (b) The diameter of an electron is about 0.0000000000004 cm. (c) A drop of water contains more than 33 billion billion molecules.

Why do moon phases repeat about every 28 days?

Why is Pluto now called a dwarf planet?

What are the 12 phases of the moon in order?

How many years does it take for Saturn to complete one full orbit around the Sun?

10.2.5 Quiz: Our Sun and Other Stars According to the Hertzsprung-Russell diagram, a star with a very high luminosity and a temperature of around 9000 K is most likely which type of star?

What color are the hottest stars? A. White B. Red-orange C. Blue D. Yellow

How would you describe the waxing versus the waning portion of the moon’s journey?

How many years will it take to reach the nearest galaxy to us if we travel at 0.01 the speed of light, knowing that its distance from us is approximately 2 million light-years?

What are five reasons Pluto is not considered a planet?

How many moons would fit across the diameter of the Sun?

Use the information from the article to answer the question. Why is Pluto now called a dwarf planet?

Which black hole is larger, Phoenix A or TON 618?

Fill in the blank: "_____________" means the period beginning one-half hour before sunrise and ending one-half hour after sunset.