Question

1. how do scientists often find exoplanet?

a) by listening for sounds
b) by looking for dimming stars
c) by digging on earth
d) by measuring wind speed

open-ended questions: answer the following questions in complete sentences per answer

1. why is the discovery of dried-up river channels on mars important?

Explanation:

For the multiple - choice question (How do scientists often find exoplanets?):

To find exoplanets, one common method is the transit method. In this method, scientists look for the dimming of a star's light. This dimming occurs when a planet passes in front of its host star (transits the star), blocking a small portion of the star's light. Option a is incorrect because sound does not travel through the vacuum of space. Option c is incorrect as we can't dig on Earth to find exoplanets. Option d is incorrect as measuring wind speed on Earth has no relation to finding exoplanets. So the correct method related to the options is looking for dimming stars.

The discovery of dried - up river channels on Mars is important for several reasons. Firstly, it provides strong evidence that Mars once had liquid water on its surface. Liquid water is a key ingredient for life as we know it, so this discovery increases the possibility that Mars may have supported life in the past. Secondly, understanding the history of water on Mars can help us learn more about the planet's geological and climatic history. It can give insights into how the planet's environment changed over time, from a potentially habitable environment to the cold, dry planet we see today. This knowledge is also valuable for future human exploration of Mars, as it can help us identify potential sources of water (in the form of ice or underground reservoirs) that could be used for drinking, growing food, or producing rocket fuel.

Answer:

b) By looking for dimming stars

For the open - ended question (Why is the discovery of dried - up river channels on Mars important?):