)The apparent brightness of the Earth is inversely proportional to the square of the distance between the Earth and the star) True or false

Q: An observer is located at 65 degrees South latitude and wants to know the declination of something…

A: Observer location=65 South maximum altitude=75 Above Southern horizon

Q: A A light-year is a unit of time B We cannot see father than 14 billion light years away C) The…

A: Light year : light year is the distance travelled by light in 1 year

Q: Which unit of measurement is larger?

A: 1 rad = 57.3 degree. So for 1 rad we required 57.3 degree.  So 1 degree = (1/57.3) < 1 rad

Q: Right Ascension and Declination is a coordinate system for objects in the sky, and is analogous to…

A: We can convert the Right Ascension (RA) into the decimal hours using the following formula: hour +…

Q: The Sun's angular diameter is measured to be 1920". The distance D of the Sun from the Earth is…

A: Given that,Sun's diameter : D = 1920'The distance of the sun from the earth : d = 1.496×1011 (m)…

Q: The earth revolves around the sun in exactly 365 1/4 days which is equivalent to 1 year. To make up…

A: Earth revolves around the sun in =365 1/4 days Everyday has 24 hours Total hours in a year= 8760…

Q: 29) Estimate the distance to the North Star if it has an absolute magnitude of -3.2 and an apparent…

A: In astronomy when studying a star or any celestial object we use two different magnitudes. Apparent…

Q: The planet Earth has a semi-major axis of a = 1.00 AU and an orbital period of P= 1 sidereal year =…

A:

Q: an object  is a located at the following equatorial coordinates (J2000): 12h 27m 53.6s (right…

A:

Q: would have be the duration of the year if the distance between earth and sun were half the present…

A: To find-Duration of the year T2=?GIven-Distance between sun and earth becomes half.

Q: average Earth-Moon distance is 3.84 X 10^5 km, while the Earth-Sun is 1.496 X 10^8 km. Since the…

A: Given that: The moon is at a distance dm=3.85×105 km The sun's distance is ds=1.496×108 km The…

Q: Static Friction Force Revisited Now let's go back and consider the static situation again. Let the…

A: Static friction fs  = μ Ν  Hence we can calculate static friction by finding the value of N.

Q: Given that H 1, H 2 are the hour angles of a star of declination δ on the prime vertical west and at…

A: The angle of declination is defined as the magnetic and geographic meridians or the angle in the…

Q: Find the parallax angle for the following planets (Mercury, Saturn and Mars)

A: Parallex angle is given as angle = diameter of planetdistance from earth θ=DR

Q: Jupiter's third-largest natural satellite, Io, follows an orbit with a semimajor axis of 422,000 km…

A: Semi major axis of Io's orbit, a = 4.22 x 105 km Orbital period of Io's orbit, P = 1.77 earth days 1…

Q: Which unit of length would most likely be used to measure the distance from Earth to stars other…

A: Answer            d) Astronomical unit

Q: What would be duration of year, if distance - between earth & the sun gett doubled? (0) 129 days (0)…

A: We need to compute-Duration of the year (T2)=?The data given as-Original orbital radius=r1New…

Q: Calculate the difference in the geostationary altitude ( in km ) by by using solar day (24 hrs) and…

A:

Q: The radius of the earth is 6400 Km and the height of a person is 1.7m, how high can you stand to see…

A: Given: Radius of earth, RE=6400 km Height of person, 1.7m To Find: Height to see the Horizon

Q: Sam is an astronomer on planet Hua, which orbits the distant star Barnard. It has recently been…

A:

Q: How much stronger does a magnitude 8.2 to a 5.0 magnitude?

A: Given that                           Magnitude(M1 ) = 8.2                           Magnitude(M2) =…

Q: This was somewhat helpful, but my radius is not 3.5km it's 5km. This is not the answer to my…

A:

Q: Use Kepler's Law, which states that the square of the time, T, required for a planet to orbit the…

A: Kepler's third law is also called the law of periods. According to this law, the square of the time…

Q: The orbital period and radius of one of these states is 11 earth years and 1000 AU. Express the mass…

A:

Q: Calculate the speed you would have with respect to the center of the planet, in m/s, if you were at…

A: sidereal day length is the time taken by planet for one rotation i.e. its time period.