Astronomy | Astrophysics Answers

You are the captain of a spaceship that is circling through a binary star system. Due to the gravitational forces and the rocket engines, the orbit of your spaceship looks like that:
The position of your spaceship (in AU) at the time t (in days) is given by:
x = 5 sin(t) y = sin(2t) z = 0
(a) How long does it take your spaceship to circle the orbit once?
(b) Find an equation that calculates the velocity v(t) of your spaceship at a given time t.
(c) The two stars are positioned at the points (4, 0, 0) and (−4, 0, 0): What is the distance of your
spaceship to the stars at the time t =
π
2
?
Expert's answer

A warning system has calculated that two asteroids will collide not far from Earth any time soon.
The smaller asteroid has the mass m and moves with the velocity vm. The bigger asteroid has the
mass M = 3m and the velocity of vM =
1
2
vm. They collide at an angle of α = 60◦ and turn into a
single heavy asteroid (inelastic collision):
M
m
α
β
(a) Calculate the velocity of the single object aer the collision.
(b) Determine the angle β aer the collision.

Why is it difficult for LyC radiation to escape galaxies with high star formation rates?

Difference between the density bounded medium and the picket fence model

The Moon has a mass of M = 7.3 · 1022 kg, a radius of R = 1.7 · 106 m and a rotation period of
T = 27.3 days. Scientists are planning to place a satellite around the Moon that always remains
above the same position (geostationary).
(a) Calculate the distance from the Moon’s surface to this satellite.
(b) Explain if such a Moon satellite is possible in reality.

The Sunburst Arc: Direct Lyman escape observed in the brightest known lensed galaxy.
T.E. Rivera-Thorsen, H. Dahle, M. Gronke, M. Bayliss, J.R. Rigby, R. Simcoe, R. Bordoloi, M. Turner, and G. Furesz,Astronomy & Astrophysics 608, (2017). Link: https://iaac.space/doc/Pre-Final-Article-2017-Sunburst-Arc.pdf ...Answer the questions related to this article:
(a) Why is it difficulty for LyC radiation to escape galaxies with high star formation rates?
(b) What is the difference between the density-bounded medium and the picket fence model?
(c) Explain the spectral shape of the perforated shell model (see article: figure 1, right box).
(d) What is the Sunburst Arc and how was it discovered?
(e) When did the scientist observe the object and which instruments did they use?
(f) What is the redshift of the Sunburst Arc and how was it determined from the data?
(g) Explain the difference between the right and the left diagram in figure 4 (see article).

A warning system has calculated that two asteroids will collide not far from Earth any time soon.
The smaller asteroid has the mass m and moves with the velocity vm. The bigger asteroid has the mass M = 3m and the velocity of v(M) = 0.5 V(m)
They collide at an angle of α = 60 degree and turn into a
single heavy asteroid (inelastic collision):

(a) Calculate the velocity of the single object after the collision.
(b) Determine the angle Bêta after the collision.

The Moon has a mass of M = 7.3*10²² kg, a radius of R = 1.7*10^6 m and a rotation period of T = 27.3 days. Scientists are planning to place a satellite around the Moon that always remains above the same position (geostationary).
(a) Calculate the distance from the Moon's surface to this satellite.
(b) Explain if such a Moon satellite is possible in reality.

What is the difference between the HII region and HI region of the interstellar medium? Explain the process involved in the detection of HI region in the ISM. For 5 marks

(d) What is the Sunburst Arc and how was it discovered?