Science How are so many exoplanets detected via transits, while transits of Mercury and Venus are so rare? Do all the chance transit alignments fit statistically?
Science, Solar System The processed images from Juno are spectacular, but they don’t resemble previous images of Jupiter. Why are they so different from those returned by earlier missions?
Science What is metallic hydrogen, and does it exist at the core of all the gas giants in our solar system?
Galaxies, Science How do you measure the rotational speed of a galaxy, taking into consideration the motion of our galaxy, solar system, planet, etc.?
Human Spaceflight I’ve read that the planned crewed Mars missions will take six months or two years to arrive. Which is it? could a longer trip be due to the heavy payload? Our rovers took only eight to nine months to arrive.
Observing How large does the Sun appear from Mercury and Venus, as compared to how we see it from Earth?
