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Astronomy
Page 7
Questions (9,984)
If a comet was at aphelion (furthest distance from the sun) in 1944 and will be at perihelion (closest point to the sun) in
1 answer
asked by
Rico
356 views
For this question assume the moon is 110 of its diameter away from the Earth.
The largest apparent size of Mercury that we ever
1 answer
asked by
Elisabeth
383 views
What is the size, i.e. the radius, of a black hole with a mass equal to that of Earth (MEarth=6×1024kg)? Give your answer to
1 answer
asked by
qwerty
321 views
Look up where Voyager 1 is now and compute how many lighthours it is away.
Round your answer to the nearest number of light
1 answer
asked by
qwerty
327 views
Which of the below statements about the CMB are true?
(i) The “hot” and “cold” spots are areas where photons have
1 answer
asked by
qwerty
446 views
What were the relative energy densities in the early Universe? (below, DE means dark energy)
(a) They remain roughly equal: �rad
1 answer
asked by
qwerty
344 views
The Universe is filled with a frozen in Higgs condensate. If this were to suddenly disappear/evaporate, what would happen?
(a)
1 answer
asked by
qwerty
413 views
What percentage of the energy budget do electrons occupy? Take the energy budget occupied by matter to be 4.4%.
(a) 3.9% (b) 0.1%
4 answers
asked by
qwerty
360 views
Basically the ``Bohr radius'' for the dark matter is
rB=ℏ^2 / GN M m^2 where m is the dark matter mass, M is the total amount
1 answer
asked by
qwerty
427 views
Calculate the amount of energy released if a total of 1.5 kg of hydrogen is fused into helium.
1 answer
asked by
Steven
335 views
On the Autumnal Equinox, you see the Moon in the Waxing Crescent Phase at an angle of 45 degrees above the western horizon. What
1 answer
asked by
Maria
345 views
1. Sun-grazing comet ISON disintegrated on November, 2013. Observation of the comet suggested an elliptical orbit with period
1 answer
asked by
keitanako
431 views
In fact, more precise calculations suggest that ISON was on a hyperbolic, unbound orbit. How much more precise?
Find the minimal
1 answer
asked by
keitanako
338 views
For an object of mass m in a circular orbit of radius R under the gravitational influence of a center of mass M, find an
1 answer
asked by
keitanako
378 views
1. In this collection of problems we will try to use what we have learned to see what information about a hypothetical Solar
3 answers
asked by
keitanako
421 views
The volume of a ball is given in terms of its radius by V=(4*pi/3)*R^3. Use this to find the average density of Nursat, i.e. the
1 answer
asked by
keitanako
384 views
What is my Astrological "Sun Sign" and how was it determine if I was born on August 12, 1953.
1 answer
asked by
Barbara
398 views
Why is it possible that the Sun may then have been in a different constellation than your "Sun Sign" on August 12, 1953.
1 answer
asked by
Barbara
411 views
a.According to the Starry Night program, which constellation the Sun was actually in at the instant of a person birth on August
1 answer
asked by
Ann
415 views
Why is it possible to see the planet Mercury at 6:45 pm on February 5, 2014.
1 answer
asked by
Rashida
399 views
What five object were found in the sky on February 5, 2014 at 9 pm.
1 answer
asked by
Ann
415 views
Why is the portion of Venus opposite the direction of the Sun not apparent.
1 answer
asked by
Barbara
381 views
Why is the portion of the Moon opposite the direction of the Sun not apparent?
1 answer
asked by
Barbara
308 views
Why is it possible to see Mercury at 6:45 pm on February 5, 2014?
1 answer
asked by
Carol
320 views
How far will Venus be from Earth on February 19, 2014?
1 answer
asked by
Carol
355 views
What type of spectrum is sunlight?
1 answer
asked by
Barbara
362 views
How can Google Earth be used to access the size of the Earth?
1 answer
asked by
Barbara
382 views
Imagine you are on some far away planetary system looking for planets in the galactic neighborhood and you spot our sun in your
1 answer
asked by
qwerty
427 views
How close to the sun Ganymede would have to be in order to hold water in its atmosphere. (in AU)
1 answer
asked by
qwerty
366 views
Consider dropping a Professor with an estimated mass of 80 kg from a safe, large distance, onto a SMBH with a mass of
1 answer
asked by
keitanako
392 views
Why are there multiple lenses cemented together to form the objective lens and the eyepiece lens?
1 answer
asked by
Rashida
317 views
Rain was once common on Mars.
Probably true Maybe/unclear Probably false
1 answer
asked by
qwerty
345 views
Imagine you are in a spaceship one million km from a black hole of mass kg. Initially you are flying directly away from it at a
3 answers
asked by
qwerty
430 views
True or False? Galaxies are distributed randomly and approximately uniformly in space.
1 answer
asked by
querty
411 views
True or False? The first galaxies formed in the regions where dark matter density was highest.
1 answer
asked by
querty
327 views
What about a for a supernova in an elliptical galaxy of 10^12 solar masses and radius of 50 kpc?
Yes or No
1 answer
asked by
qwerty
362 views
Does the probability that a single-planet system shows transits increase, decrease
or stay the same if the planet has a rather
1 answer
asked by
g
414 views
Given the random orientation of planetary orbits relative to our line of sight, do you expect most or only a minority of all
1 answer
asked by
g
387 views
How do astronomers know whether they are seeing planets or stars when they are distant?
1 answer
asked by
Ben
405 views
A bicycle trip takes 50.4 seconds. What is the average speed of the bicycle?
my work: 50.4/ 680m = 13.49m/s
6 answers
asked by
Frustrated!
407 views
What would be the approximate power-law slope of the 2-point correlation function if all galaxies were situated on thin
1 answer
asked by
Annonymous
391 views
F = GM1M2/R2 = (6.67x10-11 x 1.9891x1030 x 25) / (3000)2 =
1 answer
asked by
Anne
358 views
How can I tell a north circumpolar star from a south circumpolar one based on its declination and my location?
1 answer
asked by
Anonymous
344 views
An astronomical unit can be thought of as...
a 25 light years b 19 earth years c 93 million miles d 100 billion miles
1 answer
asked by
Red
328 views
If a planet were orbiting the Sun in an orbit three times as far as its current orbit, how many times longer would it take the
1 answer
asked by
Astronomy
411 views
Which of the different telescopes designed for the following specific types of electromagnetic waves has to be at the highest
1 answer
asked by
Francis
364 views
How much energy does the Earth receive from the Sun?
1 answer
asked by
Al
324 views
How much of the energy that the Earth receives from the Sun is reflected out into space?
1 answer
asked by
Al
196 views
Of the energy received by the Earth from the Sun, and that is not reflected into space, how is it dispersed?
1 answer
asked by
Al
164 views
On Earth, do we always see half of the Moon illuminated
1 answer
asked by
Sarah
144 views
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