What evidence did probes to Mars find that makes it a prime candidate for life?
What will be an ideal response?
Water ice at the poles, photographic evidence of past flowing and standing water, and the rover Opportunity found its landing site was once drenched with water.
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The intrinsic brightness of a star is referred to as its
A) radiance B) luminosity C) surface temperature D) apparent brightness
A wheel rotates about a fixed axis with a constant angular acceleration of 4.0 rad/s2. The diameter of the wheel is 40 cm. What is the linear speed of a point on the rim of this wheel at an instant when that point has a total linear acceleration with a magnitude of 1.2 m/s2?
A. 39 cm/s B. 42 cm/s C. 45 cm/s D. 35 cm/s E. 53 cm/s
Mars has an axial tilt more like the Earth's than any other planet
Indicate whether the statement is true or false
Which of the following statements is an explanation, not an observation?
A) Stars can shine brightly for millions of years. B) Stars shine with energy generated by nuclear fusion in their cores. C) More distant galaxies are moving away from us faster than nearby galaxies. D) All planets orbit the Sun in the same direction and in nearly the same plane.