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comment How clearly would I be able to see a galaxy with the naked eye if viewed from a “close” distance?
The Milky Way is about 1,000,000,000,000,000,000 km across. From 1,000,000 km away from the edge, it will almost stretch 180°. I would say that most of the nearby stars would be distinguishable and due to the density near the edge, they would overlap.
Jul
2
comment Eclipse on the moon
The sun is large, and yet a small moon (relatively speaking) covers it entirely. Now the shadow casts by the moon lands on the Earth (which is larger than the moon). It makes sense to me that the shadow is smaller than the Earth, even though the moon hides the sun. It all depends on where you are. 500 miles south from the location of a total eclipse, may not have the moon hiding even touching the sun.
Jul
2
comment Eclipse on the moon
How else would the moon block the sun?
Jul
2
comment Eclipse on the moon
Have you seen the map of the moon's shadow track across the Earth when there is a solar eclipse? eclipse.gsfc.nasa.gov/SEmono/TSE2017/TSE2017fig/TSE2017-usa.jpg
Jun
27
reviewed Close What to do after first year of amateur astronomy?
Jun
27
reviewed Approve Are space telescopes completely out of the earth's atmosphere?
Jun
26
comment Why is the moon a fuzzy, white ball?
Do you wear glasses? Did you remove your glasses to view through the scope?
Jun
24
reviewed No Action Needed Is the Milky Way Visible from Nebraska?
Jun
24
reviewed Approve Does Sun have a reflection on Earth?
Jun
17
reviewed Approve Is it possible to use Hubble Telescope to observe Earth in the past?
Jun
13
comment Moon's orbit around the Sun
@userLTK Yes, the larger radius of the moons' orbits will result with an orbit like Chad's second figure.
Jun
13
comment Moon's orbit around the Sun
@userLTK Jupiter's orbital speed is about 13.07 km/s and Io's orbital speed is 17.334 km/s. This means that Io moves faster backwards than Jupiter moves forward. Europa has an orbital speed of 13.740 km/s, which is just faster than what is needed to go backwards.
Jun
13
revised Moon's orbit around the Sun
deleted 11 characters in body
Jun
13
answered Moon's orbit around the Sun
Jun
6
comment Day Length on Double Planets
@HopDavid OK, so the tides influence the depth of the water, which determines when the waves break as they approach the shore. The size of the waves are determine by the wind as it blows across the water. So on a planet without tides, the location where the waves break is well defined. en.wikipedia.org/wiki/Wind_wave
Jun
6
comment Day Length on Double Planets
@HopDavid Surfers don't rely on the tide for waves, they rely on the wind, which is caused by heat from the sun. Therefore, the surfing is the same on those planets.
Jun
5
comment Do heavier elements breakdown during supernova?
@RobJeffries I removed the statement about our sun (it was unimportant since the OP wants to know about novas and supernovas).
Jun
5
revised Do heavier elements breakdown during supernova?
deleted 120 characters in body
Jun
5
revised Do heavier elements breakdown during supernova?
added 34 characters in body
May
31
revised How Much Overlap Will the Andromeda Galaxy and the Milky Way Have When They Collide?
edited title