Astronomy crossword puzzle-Nathan lang

1.a regular oval shape
2.A theory scientist believe why we are alive.
an obscuring of the light from one celestial body by the passage of another between it and the observer or between it and its source of illumination.
attached or restricted to the earth.
a meteor or shooting star
a gradual widening, especially of a skirt or pants.
the natural satellite of the earth, visible (chiefly at night) by reflected light from the sun.
the emission of energy as electromagnetic waves or as moving subatomic particles, especially high-energy particles that cause ionization.
the force that attracts a body toward the center of the earth, or toward any other physical body having mass. For most purposes Newton's laws of gravity apply, with minor modifications to take the general theory of relativity into account.
the chemical element of atomic number 2, an inert gas that is the lightest member of the noble gas series.
the region of the atmosphere and outer space seen from the earth.
nonluminous material that is postulated to exist in space and that could take any of several forms including weakly interacting particles
an optical instrument designed to make distant objects appear nearer
the curved path of a celestial object or spacecraft around a star, planet, or moon, especially a periodic elliptical revolution.
the effect whereby the position or direction of an object appears to differ when viewed from different positions
a celestial body resembling a small planet but lacking certain technical criteria that are required for it to be classed as such.
a continuous area or expanse that is free, available, or unoccupied.
National Aeronautics and Space Administration.
a cloud of gas and dust in outer space, visible in the night sky either as an indistinct bright patch or as a dark silhouette against other luminous matter.
a celestial object consisting of a nucleus of ice and dust and, when near the sun, a “tail” of gas and dust particles pointing away from the sun.
a region of space having a gravitational field so intense that no matter or radiation can escape.
a star that suddenly increases greatly in brightness because of a catastrophic explosion that ejects most of its mass.
used to classify something, or suggest that it can be classified, in terms of its position on a scale between two extreme or opposite points.
a cylindrical projectile that can be propelled to a great height or distance by the combustion of its contents, used typically as a firework or signal.
of, determined by, relating to, or resembling the moon.