What Do We See in the Sky?
One morning at sunrise, you see that the constellation Aquarius is immediately behind the Sun. Will it be behind the Sun at sunset 2 months later? If not, which constellation will it be?
No, two moths later it will be Pisces.
Imaginary star A has a peak wavelength of 400 nm. And imaginary star B has a peak wavelength of 600 nm. Which star is hotter and why?
Star A is hotter because it has a shorter peak wavelength.
What category is our Sun on the H-R diagram?
Main Sequence
One year.
One morning at sunrise, you see that the constellation Aquarius is immediately behind the Sun. Will it be behind the Sun at sunset 2 days later? If not, which constellation will it be?
Yes, it will be the same
Star B has a peak wavelength of 600 nm. What type of light would this imaginary star mainly emit?
Ultraviolet light: you must convert from nm-->m, which is 6 x 10^-7. And on the electromagnetic spectrum this falls under UV.
An imaginary star has a major axis of 1500 AU. What is the semi-major axis of this star?
750 AU
True or false: If someone was 100 million light years away from Earth and used a super powerful telescope to see Earth, they would see dinosaurs.
True. Dinosaurs roamed the Earth at that time period.
1.5 x 10^8 km
Three new telescope sites are available to build a telescope, determine which of the following would be best by knowing the wavelength they are at:
3-5 m, 10-80 nm, or 0.5-1 cm
10-80 nm because it allows for the most atmospheric opacity.
Star A and Star B have the same temperature, but Star B is much more luminous. Which star is larger? Explain.
If the stars have the same temperature, size can be determined by luminosity. Thus, Star B is larger because it has a higher luminosity.
If our universe was expanding at a higher velocity, would it have reached this size earlier or later in history?
Earlier because the higher expansion rate means our universe would get larger, quicker.
In a theoretical fusion experiment an atom called Chocolatium has a mass of 4.25 x 10^-27 and Vanillium has a mass of 1.6 x 10^-26. One atom of Chocolatium can be fused into three Vanillium atoms. How much mass will be lost during this fusion.
Using the equation E=mc^2 for both atoms (m as the mass and c as the speed of light), you can find the energy for each. Then you subtract to find the energy lost: 4.3 x 10^-27
Star X has a flux of 1.1 x 10^-10 and it is 2500 parsecs away from Earth. What is the luminosity in solar luminosities of Star X?
7.02 x 10^3 Solar luminosities.
You must use the equation F=4(pi)d^2
Is it true that more massive black holes have lower densities than less massive black holes?
Yes, that is true.
If the graph of a planet's wobble velocity shows a peak of 150 m/s and a low-point of -150 m/s, what would the amplitude of this wobble velocity be?
150 m/s
An imaginary planet has an angular diameter of 6.2” and is located 8.5x10^8 km away from Earth. What is the diameter of this planet in kilometers?
It has an angular diameter of 8.1 x 10^5.
you must use the equation: theta=diameter/distance.
Imaginary star B has a parallax angle of 6.8 x 10^-4" (arcseconds). How far away is this star in units of Parcsecs?
You must use the equation d[pc]=1/p". In this case the answer is 1470.58 pc.
In the orbit of black hole, Planet Z has a semi-major axis of 800 AU and it takes 9 years to make a full orbit. What is the mass of the black hole in kg? Hint: convert the semi-major axis to meters and the period of the orbit to seconds.
1.3 x 10^37 kg
If a graph showing the period of planet's orbit and one peak was at 250 days, and the next peak was at 750 days, what is the period of this planet's orbit?
500 days.