Astronomy Weekly Newsletter

Astronomy newsletter

Top new questions this week:

Why doesn't the New Horizons probe fly any nearer than 10,000 km from Pluto?

New Horizons is intended to pass within 10,000 km of Pluto on its flyby on July 14. This will give a maximum resolution on the surface of 50m per pixel. This seems to me a bit of a waste, when it ...

pluto new-horizons-probe  
asked by rubo77 6 votes
answered by David Hammen 6 votes

Why does the Solar System have no (natural) satellites of satellites?

What are the conditions for a planetary moon to have a satellite of its own? How far do the Solar System's bodies fall from the necessary threshold?

solar-system planets natural-satellites  
asked by Anixx 6 votes
answered by andy256 8 votes

Use Pluto's gravitation to reach the next dwarf planet

Why doesn't New Horizons fly by nearer to Pluto so the gravitational pull would slingshot the probe to one of the next dwarf planets in the outer solar system (Eris, Haumea, Makemake,...)? I would ...

pluto new-horizons-probe  
asked by rubo77 1 vote
answered by David Hammen 2 votes

On a log-log plot of surface gravity to planet mass, what is the meaning of the y-intercept?

I am playing around with data from, and am interested in the plot of surface gravity to planet mass. I reproduced this plot after downloading their data and performed a non-linear ...

gravity planets exoplanet  
asked by user44816 1 vote
answered by Rob Jeffries 2 votes

Telescope Problems

I currently own a telescope, I'm an amateur astronomer and currently just trying to view the moon. I own the Celestron PowerSeeker 70AZ. Link for information on the telescope: ...

asked by PhilTheLawyer 1 vote

Greatest hits from previous weeks:

Can our Sun become a black hole

Does every star become a black hole? Is there any probability that our sun can become a black hole? If yes then is it on its way to become a black hole? what is the current state of sun as per the ...

sun solar-system black-hole  
asked by strikers 21 votes
answered by Bobson 30 votes

How much mass does an object in space need to keep a human on its surface?

Assume there were a roughly spherical object in space like a meteorite or a comet. If I weighed 80kg on Earth, how much mass would be required for an object in space so that I could stay on its ...

gravity space planet  
asked by Sergei Basharov 7 votes
answered by Rob Jeffries 9 votes
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