Astronomy Weekly Newsletter

Astronomy newsletter

Top new questions this week:

Gas halo of our Milky Way Galaxy

This question relates to a diffuse hot gas halo of our Milky Galaxy. I've read that there is a hot diffuse halo of gas surrounding our Galaxy (NED, Caltech) I was wondering why such a halo can exist? ...

asked by MichaelJRoberts 5 votes
answered by Rob Jeffries 8 votes

Rings around a smaller, close-in planet?

Is it possible for a small, close-to-star planet to have a stable ring system--icy or otherwise? A smaller planet means the rings would have to be closer to the planet, which means the radial shear ...

asked by jvriesem 4 votes

Are we sure no planets inside Mercury orbit now?

Currently most explorations about new planets are pointing to area outside Neptune orbit, how about inside Mercury orbit? Can we say there is no planets inside Mercury orbit surely?

planets mercury  
asked by Gstestso 4 votes

Are high-speed galactic collisions survivable?

This is a hypothetical question, but it really is meant as a vivid way of asking about the affects of high-speed galactic collisions. The November 27 APOD showed the Cheshire Cat galaxy group, and the ...

galaxy-cluster x-ray  
asked by Mark Foskey 4 votes
answered by userLTK 1 vote

How (un)stable are the Lagrangian points 1, 2 and 3?

A couple questions, please: I know that the Lagrangian points 1, 2 and 3 are unstable and special Lissajous orbits plus some station-keeping are required to place a spacecraft around them. But I was ...

orbit lagrange-point  
asked by xpell 4 votes
answered by James Kilfiger 2 votes

Can an SMBH recycle dark matter into energy?

I just had a conceptual question, hopefully it makes for some really interesting answers. I was wondering, as most galaxies have an SMBH at their centre (see Kormandy & Richstone 1995; Richstone ...

dark-matter supermassive-black-hole  
asked by MichaelJRoberts 4 votes
answered by Rob Jeffries 2 votes

Venus transending behind the Earths moon December 7, 2015

Observing from Earth what are the odds thats Venus does not line up in conjunction with earths moon and does not transend behind the moon but slightly below or above with a complete visual of venus ...

asked by The Void 4 votes
answered by pela 5 votes

Greatest hits from previous weeks:

What will happen to life on Earth when the Andromeda and Milky Way galaxies collide?

It is said that the Andromeda and Milky Way galaxies are coming close to each other with a speed of approximately 400000 km/hour. They will be together in the next 4 billion years. What will happen ...

galaxy milky-way life  
asked by AmitG 15 votes
answered by Adam Davis 14 votes

Average amount of annual daylight at any place on earth

If this is the wrong group please direct me to the correct one. It seems intuitively obvious that the amount of daylight per annum should be the same for any latitude on earth. For example, 12 hours ...

orbit earth  
asked by Peter Smith 3 votes
answered by polyphant 5 votes

Can you answer these?

Stellarium script star of bethlehem

Does anyone out there have a script to replicate the star of Bethlehem. In this case meaning a conjunction of Venus and Jupiter near Regulus.

star planets  
asked by user3423695 1 vote

Would a satellite in geosynchronous orbit between the earth and moon track across the sky together?

On Nov. 25 at 2:30a.m. from southern California while viewing the moon with a 70mm D x 400mm F telescope a point of light was seen at about the 7 o'clock position below the moon. As viewed the point ...

asked by jdcrlist 1 vote

Simulate an orbit with orbital elements

I want to simulate the orbits of the planets from our solar system. I want to use orbital elements to calculate the current position(xyz) at a time t. The simulation doesn't have to be too exact, but ...

orbit orbital-elements  
asked by Rene8888 3 votes
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