If you love space and astronomy, 2018 will be an exciting year. NASA has announced windows of time for sending spacecraft to Mars and the sun. Japanese and American probes already in space are set to enter orbit around two near-Earth asteroids. And a variety of eclipses and meteor showers offer ample opportunities for skygazing.

We’ve put dates for these events and more on The Times’s Astronomy and Space Calendar. But while some dates are certain or proximate, there’s a lot to be unsure about down here on Earth.

Sometimes spacecraft aren’t ready on time for launch. Or their launches get scrubbed because of weather. Some terrestrial space agencies don’t always give much notice when they blast off.

While we aren’t ready to say some space launches will happen on a particular date, these are some of the events we’re watching out for, and we’ll update the calendar when we know more.